path: root/chromium/content/renderer/render_widget.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/render_widget.h"

#include <cmath>
#include <limits>
#include <utility>

#include "base/auto_reset.h"
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/memory/singleton.h"
#include "base/metrics/histogram_macros.h"
#include "base/optional.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/system/sys_info.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "cc/animation/animation_host.h"
#include "cc/base/features.h"
#include "cc/base/switches.h"
#include "cc/input/touch_action.h"
#include "cc/paint/paint_worklet_layer_painter.h"
#include "cc/trees/layer_tree_frame_sink.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/ukm_manager.h"
#include "components/viz/common/display/de_jelly.h"
#include "components/viz/common/features.h"
#include "components/viz/common/frame_sinks/begin_frame_source.h"
#include "components/viz/common/frame_sinks/copy_output_request.h"
#include "components/viz/common/switches.h"
#include "content/common/content_switches_internal.h"
#include "content/common/drag_event_source_info.h"
#include "content/common/drag_messages.h"
#include "content/common/render_message_filter.mojom.h"
#include "content/common/widget_messages.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/drop_data.h"
#include "content/public/common/service_names.mojom.h"
#include "content/public/common/untrustworthy_context_menu_params.h"
#include "content/public/common/use_zoom_for_dsf_policy.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/public/renderer/render_thread.h"
#include "content/renderer/drop_data_builder.h"
#include "content/renderer/frame_swap_message_queue.h"
#include "content/renderer/ime_event_guard.h"
#include "content/renderer/input/main_thread_event_queue.h"
#include "content/renderer/input/widget_input_handler_manager.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/queue_message_swap_promise.h"
#include "content/renderer/render_frame_impl.h"
#include "content/renderer/render_frame_proxy.h"
#include "content/renderer/render_process.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/render_view_impl.h"
#include "content/renderer/render_widget_screen_metrics_emulator.h"
#include "content/renderer/renderer_blink_platform_impl.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "gpu/config/gpu_finch_features.h"
#include "ipc/ipc_message_start.h"
#include "ipc/ipc_sync_message.h"
#include "ipc/ipc_sync_message_filter.h"
#include "media/base/media_switches.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "ppapi/buildflags/buildflags.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/input/web_input_event_attribution.h"
#include "third_party/blink/public/common/input/web_mouse_event.h"
#include "third_party/blink/public/common/page/web_drag_operation.h"
#include "third_party/blink/public/common/switches.h"
#include "third_party/blink/public/platform/file_path_conversion.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/scheduler/web_render_widget_scheduling_state.h"
#include "third_party/blink/public/platform/scheduler/web_thread_scheduler.h"
#include "third_party/blink/public/platform/scheduler/web_widget_scheduler.h"
#include "third_party/blink/public/platform/web_drag_data.h"
#include "third_party/blink/public/platform/web_rect.h"
#include "third_party/blink/public/platform/web_runtime_features.h"
#include "third_party/blink/public/platform/web_size.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/public/web/web_autofill_client.h"
#include "third_party/blink/public/web/web_device_emulation_params.h"
#include "third_party/blink/public/web/web_frame_widget.h"
#include "third_party/blink/public/web/web_input_method_controller.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/public/web/web_node.h"
#include "third_party/blink/public/web/web_page_popup.h"
#include "third_party/blink/public/web/web_popup_menu_info.h"
#include "third_party/blink/public/web/web_range.h"
#include "third_party/blink/public/web/web_settings.h"
#include "third_party/blink/public/web/web_view.h"
#include "third_party/blink/public/web/web_widget.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/base/clipboard/clipboard_constants.h"
#include "ui/base/ui_base_features.h"
#include "ui/base/ui_base_switches.h"
#include "ui/events/base_event_utils.h"
#include "ui/gfx/geometry/dip_util.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/switches.h"
#include "ui/gl/gl_switches.h"
#include "ui/native_theme/native_theme_features.h"
#include "ui/native_theme/overlay_scrollbar_constants_aura.h"
#include "ui/surface/transport_dib.h"

#if defined(OS_ANDROID)
#include <android/keycodes.h>
#include "base/time/time.h"
#include "components/viz/common/viz_utils.h"
#endif

#if defined(OS_POSIX)
#include "third_party/skia/include/core/SkMallocPixelRef.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#endif  // defined(OS_POSIX)

using blink::WebDeviceEmulationParams;
using blink::WebDragOperation;
using blink::WebDragOperationsMask;
using blink::WebDragData;
using blink::WebFrameWidget;
using blink::WebGestureEvent;
using blink::WebInputEvent;
using blink::WebInputEventResult;
using blink::WebInputMethodController;
using blink::WebLocalFrame;
using blink::WebMouseEvent;
using blink::WebMouseWheelEvent;
using blink::WebNavigationPolicy;
using blink::WebNode;
using blink::WebPagePopup;
using blink::WebRange;
using blink::WebRect;
using blink::WebSize;
using blink::WebString;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
using blink::WebVector;
using blink::WebWidget;

namespace content {

namespace {

RenderWidget::CreateRenderWidgetFunction g_create_render_widget_for_frame =
    nullptr;

const base::Feature kUnpremultiplyAndDitherLowBitDepthTiles = {
    "UnpremultiplyAndDitherLowBitDepthTiles", base::FEATURE_ENABLED_BY_DEFAULT};

typedef std::map<std::string, ui::TextInputMode> TextInputModeMap;

static const char* kOOPIF = "OOPIF";
static const char* kRenderer = "Renderer";

#if defined(OS_ANDROID)
// With 32 bit pixels, this would mean less than 400kb per buffer. Much less
// than required for, say, nHD.
static const int kSmallScreenPixelThreshold = 1e5;
bool IsSmallScreen(const gfx::Size& size) {
  int area = 0;
  if (!size.GetCheckedArea().AssignIfValid(&area))
    return false;
  return area < kSmallScreenPixelThreshold;
}
#endif

class WebWidgetLockTarget : public content::MouseLockDispatcher::LockTarget {
 public:
  explicit WebWidgetLockTarget(RenderWidget* render_widget)
      : render_widget_(render_widget) {}

  void OnLockMouseACK(bool succeeded) override {
    if (succeeded)
      render_widget_->GetWebWidget()->DidAcquirePointerLock();
    else
      render_widget_->GetWebWidget()->DidNotAcquirePointerLock();
  }

  void OnMouseLockLost() override {
    render_widget_->GetWebWidget()->DidLosePointerLock();
  }

  bool HandleMouseLockedInputEvent(const blink::WebMouseEvent& event) override {
    // The WebWidget handles mouse lock in Blink's handleInputEvent().
    return false;
  }

 private:
  // The RenderWidget owns this instance and is guaranteed to outlive it.
  RenderWidget* render_widget_;
};

WebDragData DropMetaDataToWebDragData(
    const std::vector<DropData::Metadata>& drop_meta_data) {
  std::vector<WebDragData::Item> item_list;
  for (const auto& meta_data_item : drop_meta_data) {
    if (meta_data_item.kind == DropData::Kind::STRING) {
      WebDragData::Item item;
      item.storage_type = WebDragData::Item::kStorageTypeString;
      item.string_type = WebString::FromUTF16(meta_data_item.mime_type);
      // Have to pass a dummy URL here instead of an empty URL because the
      // DropData received by browser_plugins goes through a round trip:
      // DropData::MetaData --> WebDragData-->DropData. In the end, DropData
      // will contain an empty URL (which means no URL is dragged) if the URL in
      // WebDragData is empty.
      if (base::EqualsASCII(meta_data_item.mime_type, ui::kMimeTypeURIList)) {
        item.string_data = WebString::FromUTF8("about:dragdrop-placeholder");
      }
      item_list.push_back(item);
      continue;
    }

    // TODO(hush): crbug.com/584789. Blink needs to support creating a file with
    // just the mimetype. This is needed to drag files to WebView on Android
    // platform.
    if ((meta_data_item.kind == DropData::Kind::FILENAME) &&
        !meta_data_item.filename.empty()) {
      WebDragData::Item item;
      item.storage_type = WebDragData::Item::kStorageTypeFilename;
      item.filename_data = blink::FilePathToWebString(meta_data_item.filename);
      item_list.push_back(item);
      continue;
    }

    if (meta_data_item.kind == DropData::Kind::FILESYSTEMFILE) {
      WebDragData::Item item;
      item.storage_type = WebDragData::Item::kStorageTypeFileSystemFile;
      item.file_system_url = meta_data_item.file_system_url;
      item_list.push_back(item);
      continue;
    }
  }

  WebDragData result;
  result.SetItems(item_list);
  return result;
}

WebDragData DropDataToWebDragData(const DropData& drop_data) {
  std::vector<WebDragData::Item> item_list;

  // These fields are currently unused when dragging into WebKit.
  DCHECK(drop_data.download_metadata.empty());
  DCHECK(drop_data.file_contents.empty());
  DCHECK(drop_data.file_contents_content_disposition.empty());

  if (drop_data.text) {
    WebDragData::Item item;
    item.storage_type = WebDragData::Item::kStorageTypeString;
    item.string_type = WebString::FromUTF8(ui::kMimeTypeText);
    item.string_data = WebString::FromUTF16(*drop_data.text);
    item_list.push_back(item);
  }

  if (!drop_data.url.is_empty()) {
    WebDragData::Item item;
    item.storage_type = WebDragData::Item::kStorageTypeString;
    item.string_type = WebString::FromUTF8(ui::kMimeTypeURIList);
    item.string_data = WebString::FromUTF8(drop_data.url.spec());
    item.title = WebString::FromUTF16(drop_data.url_title);
    item_list.push_back(item);
  }

  if (drop_data.html) {
    WebDragData::Item item;
    item.storage_type = WebDragData::Item::kStorageTypeString;
    item.string_type = WebString::FromUTF8(ui::kMimeTypeHTML);
    item.string_data = WebString::FromUTF16(*drop_data.html);
    item.base_url = drop_data.html_base_url;
    item_list.push_back(item);
  }

  for (const ui::FileInfo& filename : drop_data.filenames) {
    WebDragData::Item item;
    item.storage_type = WebDragData::Item::kStorageTypeFilename;
    item.filename_data = blink::FilePathToWebString(filename.path);
    item.display_name_data =
        blink::FilePathToWebString(base::FilePath(filename.display_name));
    item_list.push_back(item);
  }

  for (const DropData::FileSystemFileInfo& file : drop_data.file_system_files) {
    WebDragData::Item item;
    item.storage_type = WebDragData::Item::kStorageTypeFileSystemFile;
    item.file_system_url = file.url;
    item.file_system_file_size = file.size;
    item.file_system_id = blink::WebString::FromASCII(file.filesystem_id);
    item_list.push_back(item);
  }

  for (const auto& data : drop_data.custom_data) {
    WebDragData::Item item;
    item.storage_type = WebDragData::Item::kStorageTypeString;
    item.string_type = WebString::FromUTF16(data.first);
    item.string_data = WebString::FromUTF16(data.second);
    item_list.push_back(item);
  }

  WebDragData result;
  result.SetItems(item_list);
  result.SetFilesystemId(WebString::FromUTF16(drop_data.filesystem_id));
  return result;
}

#if BUILDFLAG(ENABLE_PLUGINS)
blink::WebTextInputType ConvertTextInputType(ui::TextInputType type) {
  // Check the type is in the range representable by ui::TextInputType.
  DCHECK_LE(type, static_cast<int>(ui::TEXT_INPUT_TYPE_MAX))
      << "blink::WebTextInputType and ui::TextInputType not synchronized";
  return static_cast<blink::WebTextInputType>(type);
}
#endif

static bool ComputePreferCompositingToLCDText(
    CompositorDependencies* compositor_deps,
    float device_scale_factor) {
  const base::CommandLine& command_line =
      *base::CommandLine::ForCurrentProcess();
  if (command_line.HasSwitch(switches::kDisablePreferCompositingToLCDText))
    return false;
#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
  // On Android, we never have subpixel antialiasing. On Chrome OS we prefer to
  // composite all scrollers for better scrolling performance.
  return true;
#else
  // Prefer compositing if the device scale is high enough that losing subpixel
  // antialiasing won't have a noticeable effect on text quality.
  // Note: We should keep kHighDPIDeviceScaleFactorThreshold in
  // cc/metrics/lcd_text_metrics_reporter.cc the same as the value below.
  if (device_scale_factor >= 1.5f)
    return true;
  if (command_line.HasSwitch(switches::kEnablePreferCompositingToLCDText))
    return true;
  if (!compositor_deps->IsLcdTextEnabled())
    return true;
  if (base::FeatureList::IsEnabled(features::kPreferCompositingToLCDText))
    return true;
  return false;
#endif
}

viz::FrameSinkId GetRemoteFrameSinkId(const blink::WebHitTestResult& result) {
  const blink::WebNode& node = result.GetNode();
  DCHECK(!node.IsNull());
  blink::WebFrame* result_frame = blink::WebFrame::FromFrameOwnerElement(node);
  if (!result_frame || !result_frame->IsWebRemoteFrame())
    return viz::FrameSinkId();

  blink::WebRemoteFrame* remote_frame = result_frame->ToWebRemoteFrame();
  if (remote_frame->IsIgnoredForHitTest() || !result.ContentBoxContainsPoint())
    return viz::FrameSinkId();

  return RenderFrameProxy::FromWebFrame(remote_frame)->frame_sink_id();
}

blink::mojom::DidOverscrollParamsPtr ToOverscrollParams(
    const blink::InputHandlerProxy::DidOverscrollParams* params) {
  if (!params)
    return nullptr;
  return blink::mojom::DidOverscrollParams::New(
      params->accumulated_overscroll, params->latest_overscroll_delta,
      params->current_fling_velocity, params->causal_event_viewport_point,
      params->overscroll_behavior);
}

}  // namespace

// RenderWidget ---------------------------------------------------------------

// static
void RenderWidget::InstallCreateForFrameHook(
    CreateRenderWidgetFunction create_widget) {
  g_create_render_widget_for_frame = create_widget;
}

std::unique_ptr<RenderWidget> RenderWidget::CreateForFrame(
    int32_t widget_routing_id,
    CompositorDependencies* compositor_deps,
    bool never_composited) {
  if (g_create_render_widget_for_frame) {
    return g_create_render_widget_for_frame(widget_routing_id, compositor_deps,
                                            /*hidden=*/true, never_composited);
  }

  return std::make_unique<RenderWidget>(widget_routing_id, compositor_deps,
                                        /*hidden=*/true, never_composited);
}

RenderWidget* RenderWidget::CreateForPopup(
    int32_t widget_routing_id,
    CompositorDependencies* compositor_deps,
    bool hidden,
    bool never_composited) {
  return new RenderWidget(widget_routing_id, compositor_deps, hidden,
                          never_composited);
}

RenderWidget::RenderWidget(int32_t widget_routing_id,
                           CompositorDependencies* compositor_deps,
                           bool hidden,
                           bool never_composited)
    : routing_id_(widget_routing_id),
      compositor_deps_(compositor_deps),
      is_hidden_(hidden),
      never_composited_(never_composited),
      frame_swap_message_queue_(new FrameSwapMessageQueue(routing_id_)) {
  DCHECK_NE(routing_id_, MSG_ROUTING_NONE);
  DCHECK(RenderThread::IsMainThread());
  DCHECK(compositor_deps_);
}

RenderWidget::~RenderWidget() {
  DCHECK(!webwidget_) << "Leaking our WebWidget!";
  DCHECK(closing_)
      << " RenderWidget must be destroyed via RenderWidget::Close()";
}

void RenderWidget::InitForPopup(ShowCallback show_callback,
                                RenderWidget* opener_widget,
                                blink::WebPagePopup* web_page_popup,
                                const ScreenInfo& screen_info) {
  popup_ = true;
  Initialize(std::move(show_callback), web_page_popup, screen_info);

  if (opener_widget->device_emulator_) {
    opener_widget_screen_origin_ =
        opener_widget->device_emulator_->ViewRectOrigin();
    opener_original_widget_screen_origin_ =
        opener_widget->device_emulator_->original_view_rect().origin();
    opener_emulator_scale_ = opener_widget->GetEmulatorScale();
  }
}

void RenderWidget::InitForPepperFullscreen(ShowCallback show_callback,
                                           blink::WebWidget* web_widget,
                                           const ScreenInfo& screen_info) {
  pepper_fullscreen_ = true;
  Initialize(std::move(show_callback), web_widget, screen_info);
}

void RenderWidget::InitForMainFrame(ShowCallback show_callback,
                                    blink::WebFrameWidget* web_frame_widget,
                                    const ScreenInfo& screen_info) {
  Initialize(std::move(show_callback), web_frame_widget, screen_info);
}

void RenderWidget::InitForChildLocalRoot(
    blink::WebFrameWidget* web_frame_widget,
    const ScreenInfo& screen_info) {
  for_child_local_root_frame_ = true;
  Initialize(base::NullCallback(), web_frame_widget, screen_info);
}

void RenderWidget::CloseForFrame(std::unique_ptr<RenderWidget> widget) {
  DCHECK(for_frame());
  DCHECK_EQ(widget.get(), this);  // This method takes ownership of |this|.

  Close(std::move(widget));
}

void RenderWidget::Initialize(ShowCallback show_callback,
                              WebWidget* web_widget,
                              const ScreenInfo& screen_info) {
  DCHECK_NE(routing_id_, MSG_ROUTING_NONE);
  DCHECK(web_widget);

  show_callback_ = std::move(show_callback);

#if defined(OS_MACOSX)
  text_input_client_observer_ =
      std::make_unique<TextInputClientObserver>(for_frame() ? this : nullptr);
#endif

  webwidget_mouse_lock_target_.reset(new WebWidgetLockTarget(this));
  mouse_lock_dispatcher_.reset(new RenderWidgetMouseLockDispatcher(this));

  RenderThread::Get()->AddRoute(routing_id_, this);

  webwidget_ = web_widget;
  if (auto* scheduler_state = GetWebWidget()->RendererWidgetSchedulingState())
    scheduler_state->SetHidden(is_hidden());

  InitCompositing(screen_info);

  // If the widget is hidden, delay starting the compositor until the user
  // shows it. Otherwise start the compositor immediately. If the widget is
  // for a provisional frame, this importantly starts the compositor before
  // the frame is inserted into the frame tree, which impacts first paint
  // metrics.
  if (!is_hidden_ && !never_composited_)
    web_widget->SetCompositorVisible(true);

  // Note that this calls into the WebWidget.
  UpdateSurfaceAndScreenInfo(local_surface_id_allocation_from_parent_,
                             CompositorViewportRect(), screen_info);
}

bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
  // The EnableDeviceEmulation message is sent to a provisional RenderWidget
  // before the navigation completes. Some investigation into why is done in
  // https://chromium-review.googlesource.com/c/chromium/src/+/1853675/5#message-e6edc3fd708d7d267ee981ffe43cae090b37a906
  // but it's unclear what would need to be done to delay this until after
  // navigation.
  bool handled = false;
  IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)
    IPC_MESSAGE_HANDLER(WidgetMsg_EnableDeviceEmulation,
                        OnEnableDeviceEmulation)
  IPC_END_MESSAGE_MAP()
  if (handled)
    return true;

  // We shouldn't receive IPC messages on provisional frames. It's possible the
  // message was destined for a RenderWidget that was destroyed and then
  // recreated since it keeps the same routing id. Just drop it here if that
  // happened.
  if (IsForProvisionalFrame())
    return false;

#if defined(OS_MACOSX)
  if (IPC_MESSAGE_CLASS(message) == TextInputClientMsgStart)
    return text_input_client_observer_->OnMessageReceived(message);
#endif

  IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)
    IPC_MESSAGE_HANDLER(WidgetMsg_DisableDeviceEmulation,
                        OnDisableDeviceEmulation)
    IPC_MESSAGE_HANDLER(WidgetMsg_ShowContextMenu, OnShowContextMenu)
    IPC_MESSAGE_HANDLER(WidgetMsg_Close, OnClose)
    IPC_MESSAGE_HANDLER(WidgetMsg_UpdateVisualProperties,
                        OnUpdateVisualProperties)
    IPC_MESSAGE_HANDLER(WidgetMsg_WasHidden, OnWasHidden)
    IPC_MESSAGE_HANDLER(WidgetMsg_WasShown, OnWasShown)
    IPC_MESSAGE_HANDLER(WidgetMsg_SetActive, OnSetActive)
    IPC_MESSAGE_HANDLER(WidgetMsg_SetBounds_ACK, OnRequestSetBoundsAck)
    IPC_MESSAGE_HANDLER(WidgetMsg_UpdateScreenRects, OnUpdateScreenRects)
    IPC_MESSAGE_HANDLER(WidgetMsg_SetViewportIntersection,
                        OnSetViewportIntersection)
    IPC_MESSAGE_HANDLER(WidgetMsg_WaitForNextFrameForTests,
                        OnWaitNextFrameForTests)
    IPC_MESSAGE_HANDLER(DragMsg_TargetDragEnter, OnDragTargetDragEnter)
    IPC_MESSAGE_HANDLER(DragMsg_TargetDrop, OnDragTargetDrop)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

bool RenderWidget::Send(IPC::Message* message) {
  // Provisional frames don't send IPCs until they are swapped in/committed.
  CHECK(!IsForProvisionalFrame());
  // Don't send any messages during shutdown.
  DCHECK(!closing_);

  // If given a messsage without a routing ID, then assign our routing ID.
  if (message->routing_id() == MSG_ROUTING_NONE)
    message->set_routing_id(routing_id_);

  return RenderThread::Get()->Send(message);
}

bool RenderWidget::ShouldHandleImeEvents() const {
  if (delegate())
    return GetWebWidget()->HasFocus();
  if (for_child_local_root_frame_) {
    // TODO(ekaramad): We track page focus in all RenderViews on the page but
    // the RenderWidgets corresponding to child local roots do not get the
    // update. For now, this method returns true when the RenderWidget is for a
    // child local frame, i.e., IME events will be processed regardless of page
    // focus. We should revisit this after page focus for OOPIFs has been fully
    // resolved (https://crbug.com/689777).
    return true;
  }
  // Not a frame widget.
  return false;
}

void RenderWidget::OnClose() {
  DCHECK(popup_ || pepper_fullscreen_);

  Close(base::WrapUnique(this));
}

void RenderWidget::OnUpdateVisualProperties(
    const VisualProperties& visual_properties_from_browser) {
  TRACE_EVENT0("renderer", "RenderWidget::OnUpdateVisualProperties");

  // UpdateVisualProperties is used to receive properties from the browser
  // process for this RenderWidget. There are roughly 4 types of
  // VisualProperties.
  // TODO(danakj): Splitting these 4 types of properties apart and making them
  // more explicit could be super useful to understanding this code.
  // 1. Unique to each RenderWidget. Computed by the RenderWidgetHost and passed
  //    to the RenderWidget which consumes it here.
  //    Example: new_size.
  // 2. Global properties, which are given to each RenderWidget (to maintain
  //    the requirement that a RenderWidget is updated atomically). These
  //    properties are usually the same for every RenderWidget, except when
  //    device emulation changes them in the main frame RenderWidget only.
  //    Example: screen_info.
  // 3. Computed in the renderer of the main frame RenderWidget (in blink
  //    usually). Passed down through the waterfall dance to child frame
  //    RenderWidgets. Here that step is performed by passing the value along
  //    to all RenderFrameProxy objects that are below this RenderWidgets in the
  //    frame tree. The main frame (top level) RenderWidget ignores this value
  //    from its RenderWidgetHost since it is controlled in the renderer. Child
  //    frame RenderWidgets consume the value from their RenderWidgetHost.
  //    Example: page_scale_factor.
  // 4. Computed independently in the renderer for each RenderWidget (in blink
  //    usually). Passed down from the parent to the child RenderWidgets through
  //    the waterfall dance, but the value only travels one step - the child
  //    frame RenderWidget would compute values for grandchild RenderWidgets
  //    independently. Here the value is passed to child frame RenderWidgets by
  //    passing the value along to all RenderFrameProxy objects that are below
  //    this RenderWidget in the frame tree. Each RenderWidget consumes this
  //    value when it is received from its RenderWidgetHost.
  //    Example: compositor_viewport_pixel_rect.
  // For each of these properties:
  //   If the RenderView/WebView also knows these properties, each RenderWidget
  //   will pass them along to the RenderView as it receives it, even if there
  //   are multiple RenderWidgets related to the same RenderView.
  //   However when the main frame in the renderer is the source of truth,
  //   then child widgets must not clobber that value! In all cases child frames
  //   do not need to update state in the RenderView when a local main frame is
  //   present as it always sets the value first.
  //   TODO(danakj): This does create a race if there are multiple
  //   UpdateVisualProperties updates flowing through the RenderWidget tree at
  //   the same time, and it seems that only one RenderWidget for each
  //   RenderView should be responsible for this update.
  //
  //   This operation is done by going through RenderFrameImpl to pass the value
  //   to the RenderViewImpl. While this class does not use RenderViewImpl
  //   directly, it speaks through the RenderFrameImpl::*OnRenderView() methods.
  //   TODO(danakj): A more explicit API to give values from here to RenderView
  //   and/or WebView would be nice. Also a more explicit API to give values to
  //   the RenderFrameProxy in one go, instead of setting each property
  //   independently, causing an update IPC from the RenderFrameProxy for each
  //   one.
  //
  //   See also:
  //   https://docs.google.com/document/d/1G_fR1D_0c1yke8CqDMddoKrDGr3gy5t_ImEH4hKNIII/edit#

  VisualProperties visual_properties = visual_properties_from_browser;
  // Web tests can override the device scale factor in the renderer.
  if (device_scale_factor_for_testing_) {
    visual_properties.screen_info.device_scale_factor =
        device_scale_factor_for_testing_;
    visual_properties.compositor_viewport_pixel_rect =
        gfx::Rect(gfx::ScaleToCeiledSize(
            visual_properties.new_size,
            visual_properties.screen_info.device_scale_factor));
  }
  // Web tests can override the zoom level in the renderer.
  if (zoom_level_for_testing_ != -INFINITY)
    visual_properties.zoom_level = zoom_level_for_testing_;

  // Inform the rendering thread of the color space indicating the presence of
  // HDR capabilities. The HDR bit happens to be globally true/false for all
  // browser windows (on Windows OS) and thus would be the same for all
  // RenderWidgets, so clobbering each other works out since only the HDR bit is
  // used. See https://crbug.com/803451 and
  // https://chromium-review.googlesource.com/c/chromium/src/+/852912/15#message-68bbd3e25c3b421a79cd028b2533629527d21fee
  //
  // The RenderThreadImpl can be null in tests.
  {
    RenderThreadImpl* render_thread = RenderThreadImpl::current();
    if (render_thread)
      render_thread->SetRenderingColorSpace(
          visual_properties.screen_info.color_space);
  }

  // TODO(danakj): In order to synchronize updates between local roots, the
  // display mode should be propagated to RenderFrameProxies and down through
  // their RenderWidgetHosts to child RenderWidgets via the VisualProperties
  // waterfall, instead of coming to each RenderWidget independently.
  // https://developer.mozilla.org/en-US/docs/Web/CSS/@media/display-mode
  GetWebWidget()->SetDisplayMode(visual_properties.display_mode);

  if (delegate()) {
    if (size_ != visual_properties.new_size) {
      // Only hide popups when the size changes. Eg https://crbug.com/761908.
      blink::WebView* web_view = GetFrameWidget()->LocalRoot()->View();
      web_view->CancelPagePopup();
    }

    SetAutoResizeMode(visual_properties.auto_resize_enabled,
                      visual_properties.min_size_for_auto_resize,
                      visual_properties.max_size_for_auto_resize,
                      visual_properties.screen_info.device_scale_factor);

    browser_controls_params_ = visual_properties.browser_controls_params;
  }

  if (for_frame()) {
    SetZoomLevel(visual_properties.zoom_level);

    if (root_widget_window_segments_ !=
        visual_properties.root_widget_window_segments) {
      root_widget_window_segments_ =
          visual_properties.root_widget_window_segments;

      blink::WebVector<blink::WebRect> web_segments;
      web_segments.reserve(root_widget_window_segments_.size());
      for (const auto& segment : root_widget_window_segments_)
        web_segments.emplace_back(segment);

      GetWebWidget()->SetWindowSegments(std::move(web_segments));

      // Propagate changes down to child local root RenderWidgets in other frame
      // trees/processes.
      for (auto& observer : render_frame_proxies_)
        observer.OnRootWindowSegmentsChanged(root_widget_window_segments_);
    }

    bool capture_sequence_number_changed =
        visual_properties.capture_sequence_number !=
        last_capture_sequence_number_;
    if (capture_sequence_number_changed) {
      last_capture_sequence_number_ = visual_properties.capture_sequence_number;

      // Propagate changes down to child local root RenderWidgets and
      // BrowserPlugins in other frame trees/processes.
      for (auto& observer : render_frame_proxies_) {
        observer.UpdateCaptureSequenceNumber(
            visual_properties.capture_sequence_number);
      }
    }
  }

  layer_tree_host_->SetBrowserControlsParams(
      visual_properties.browser_controls_params);

  if (!auto_resize_mode_) {
    if (visual_properties.is_fullscreen_granted != is_fullscreen_granted_) {
      is_fullscreen_granted_ = visual_properties.is_fullscreen_granted;
      if (is_fullscreen_granted_)
        GetWebWidget()->DidEnterFullscreen();
      else
        GetWebWidget()->DidExitFullscreen();
    }
  }

  gfx::Size old_visible_viewport_size = visible_viewport_size_;

  if (device_emulator_) {
    DCHECK(!auto_resize_mode_);
    DCHECK(!synchronous_resize_mode_for_testing_);

    // TODO(danakj): Have RenderWidget grab emulated values from the emulator
    // instead of making it call back into RenderWidget, then we can do this
    // with a single UpdateSurfaceAndScreenInfo() call. The emulator may
    // change the ScreenInfo and then will call back to RenderWidget. Before
    // that we keep the current (possibly emulated) ScreenInfo.
    UpdateSurfaceAndScreenInfo(
        visual_properties.local_surface_id_allocation.value_or(
            viz::LocalSurfaceIdAllocation()),
        visual_properties.compositor_viewport_pixel_rect, screen_info_);

    // This will call back into this class to set the widget size, visible
    // viewport size, screen info and screen rects, based on the device
    // emulation.
    device_emulator_->OnSynchronizeVisualProperties(
        visual_properties.screen_info, visual_properties.new_size,
        visual_properties.visible_viewport_size);
  } else {
    // We can ignore browser-initialized resizing during synchronous
    // (renderer-controlled) mode, unless it is switching us to/from
    // fullsreen mode or changing the device scale factor.
    bool ignore_resize_ipc = synchronous_resize_mode_for_testing_;
    if (ignore_resize_ipc) {
      // TODO(danakj): Does the browser actually change DSF inside a web test??
      // TODO(danakj): Isn't the display mode check redundant with the
      // fullscreen one?
      if (visual_properties.is_fullscreen_granted != is_fullscreen_granted_ ||
          visual_properties.screen_info.device_scale_factor !=
              screen_info_.device_scale_factor)
        ignore_resize_ipc = false;
    }

    // When controlling the size in the renderer, we should ignore sizes given
    // by the browser IPC here.
    // TODO(danakj): There are many things also being ignored that aren't the
    // widget's size params. It works because tests that use this mode don't
    // change those parameters, I guess. But it's more complicated then because
    // it looks like they are related to sync resize mode. Let's move them out
    // of this block.
    if (!ignore_resize_ipc) {
      gfx::Rect new_compositor_viewport_pixel_rect =
          visual_properties.compositor_viewport_pixel_rect;
      if (auto_resize_mode_) {
        new_compositor_viewport_pixel_rect = gfx::Rect(gfx::ScaleToCeiledSize(
            size_, visual_properties.screen_info.device_scale_factor));
      }

      UpdateSurfaceAndScreenInfo(
          visual_properties.local_surface_id_allocation.value_or(
              viz::LocalSurfaceIdAllocation()),
          new_compositor_viewport_pixel_rect, visual_properties.screen_info);

      if (for_frame()) {
        RenderFrameImpl* render_frame =
            RenderFrameImpl::FromWebFrame(GetFrameWidget()->LocalRoot());
        // This causes compositing state to be modified which dirties the
        // document lifecycle. Android Webview relies on the document
        // lifecycle being clean after the RenderWidget is initialized, in
        // order to send IPCs that query and change compositing state. So
        // ResizeWebWidget() must come after this call, as it runs the entire
        // document lifecycle.
        render_frame->SetPreferCompositingToLCDTextEnabledOnRenderView(
            ComputePreferCompositingToLCDText(
                compositor_deps_, screen_info_.device_scale_factor));
      }

      // Store this even when auto-resizing, it is the size of the full viewport
      // used for clipping, and this value is propagated down the RenderWidget
      // hierarchy via the VisualProperties waterfall.
      visible_viewport_size_ = visual_properties.visible_viewport_size;

      if (!auto_resize_mode_) {
        size_ = visual_properties.new_size;
        ResizeWebWidget();
      }
    }
  }

  if (!delegate()) {
    // The main frame controls the page scale factor, from blink. For other
    // frame widgets, the page scale is received from its parent as part of
    // the visual properties here. While blink doesn't need to know this
    // page scale factor outside the main frame, the compositor does in
    // order to produce its output at the correct scale.
    layer_tree_host_->SetExternalPageScaleFactor(
        visual_properties.page_scale_factor,
        visual_properties.is_pinch_gesture_active);

    // Store the value to give to any new RenderFrameProxy that is
    // registered.
    page_scale_factor_from_mainframe_ = visual_properties.page_scale_factor;
    // Similarly, only the main frame knows when a pinch gesture is active,
    // but this information is needed in subframes so they can throttle
    // re-rastering in the same manner as the main frame.
    // |is_pinch_gesture_active| follows the same path to the subframe
    // compositor(s) as |page_scale_factor|.
    is_pinch_gesture_active_from_mainframe_ =
        visual_properties.is_pinch_gesture_active;

    // Push the page scale factor down to any child RenderWidgets via our
    // child proxy frames.
    // TODO(danakj): This ends up setting the page scale factor in the
    // RenderWidgetHost of the child RenderWidget, so that it can bounce
    // the value down to its RenderWidget. Since this is essentially a
    // global value per-page, we could instead store it once in the browser
    // (such as in RenderViewHost) and distribute it to each frame-hosted
    // RenderWidget from there.
    for (auto& child_proxy : render_frame_proxies_) {
      child_proxy.OnPageScaleFactorChanged(
          visual_properties.page_scale_factor,
          visual_properties.is_pinch_gesture_active);
    }
  }

  if (old_visible_viewport_size != visible_viewport_size_) {
    for (auto& render_frame : render_frames_)
      render_frame.ResetHasScrolledFocusedEditableIntoView();

    // Propagate changes down to child local root RenderWidgets and
    // BrowserPlugins in other frame trees/processes.
    for (auto& observer : render_frame_proxies_)
      observer.OnVisibleViewportSizeChanged(visible_viewport_size_);
  }
  // TODO(crbug.com/939118): ScrollFocusedNodeIntoViewForWidget does not work
  // when the focused node is inside an OOPIF. This code path where
  // scroll_focused_node_into_view is set is used only for WebView, crbug
  // 939118 tracks fixing webviews to not use scroll_focused_node_into_view.
  if (delegate() && visual_properties.scroll_focused_node_into_view)
    delegate()->ScrollFocusedNodeIntoViewForWidget();

  AfterUpdateVisualProperties();
}

void RenderWidget::OnEnableDeviceEmulation(
    const blink::WebDeviceEmulationParams& params) {
  // Device emulation can only be applied to the local main frame render widget.
  // TODO(https://crbug.com/1006052): We should move emulation into the browser
  // and send consistent ScreenInfo and ScreenRects to all RenderWidgets based
  // on emulation.
  if (!delegate_)
    return;

  if (!device_emulator_) {
    device_emulator_ = std::make_unique<RenderWidgetScreenMetricsEmulator>(
        this, screen_info_, size_, visible_viewport_size_, widget_screen_rect_,
        window_screen_rect_);
  }
  device_emulator_->ChangeEmulationParams(params);
}

void RenderWidget::OnDisableDeviceEmulation() {
  // Device emulation can only be applied to the local main frame render widget.
  // TODO(https://crbug.com/1006052): We should move emulation into the browser
  // and send consistent ScreenInfo and ScreenRects to all RenderWidgets based
  // on emulation.
  if (!delegate_ || !device_emulator_)
    return;
  device_emulator_->DisableAndApply();
  device_emulator_.reset();
}

float RenderWidget::GetEmulatorScale() const {
  if (device_emulator_)
    return device_emulator_->scale();
  return 1;
}

void RenderWidget::SetAutoResizeMode(bool auto_resize,
                                     const gfx::Size& min_size_before_dsf,
                                     const gfx::Size& max_size_before_dsf,
                                     float device_scale_factor) {
  bool was_changed = auto_resize_mode_ != auto_resize;
  auto_resize_mode_ = auto_resize;

  min_size_for_auto_resize_ = min_size_before_dsf;
  max_size_for_auto_resize_ = max_size_before_dsf;

  if (auto_resize) {
    gfx::Size min_auto_size = min_size_for_auto_resize_;
    gfx::Size max_auto_size = max_size_for_auto_resize_;
    if (compositor_deps_->IsUseZoomForDSFEnabled()) {
      min_auto_size =
          gfx::ScaleToCeiledSize(min_auto_size, device_scale_factor);
      max_auto_size =
          gfx::ScaleToCeiledSize(max_auto_size, device_scale_factor);
    }
    delegate()->ApplyAutoResizeLimitsForWidget(min_auto_size, max_auto_size);
  } else if (was_changed) {
    delegate()->DisableAutoResizeForWidget();
  }
}

void RenderWidget::SetZoomLevel(double zoom_level) {
  RenderFrameImpl* render_frame =
      RenderFrameImpl::FromWebFrame(GetFrameWidget()->LocalRoot());

  bool zoom_level_changed = render_frame->SetZoomLevelOnRenderView(zoom_level);
  if (zoom_level_changed) {
    // Hide popups when the zoom changes.
    // TODO(danakj): This should go through RenderFrame, and the Delegate path
    // should be replaced.
    blink::WebView* web_view = GetFrameWidget()->LocalRoot()->View();
    web_view->CancelPagePopup();

    // Propagate changes down to child local root RenderWidgets and
    // BrowserPlugins in other frame trees/processes.
    zoom_level_ = zoom_level;
    for (auto& observer : render_frame_proxies_)
      observer.OnZoomLevelChanged(zoom_level);
  }
}

void RenderWidget::OnWasHidden() {
  // A provisional frame widget will never be hidden since that would require it
  // to be shown first. A frame must be attached to the frame tree before
  // changing visibility.
  DCHECK(!IsForProvisionalFrame());

  TRACE_EVENT0("renderer", "RenderWidget::OnWasHidden");

  SetHidden(true);

  tab_switch_time_recorder_.TabWasHidden();

  for (auto& observer : render_frames_)
    observer.WasHidden();
}

void RenderWidget::OnWasShown(
    base::TimeTicks show_request_timestamp,
    bool was_evicted,
    const base::Optional<content::RecordContentToVisibleTimeRequest>&
        record_tab_switch_time_request) {
  // The frame must be attached to the frame tree (which makes it no longer
  // provisional) before changing visibility.
  DCHECK(!IsForProvisionalFrame());

  TRACE_EVENT_WITH_FLOW0("renderer", "RenderWidget::OnWasShown", routing_id(),
                         TRACE_EVENT_FLAG_FLOW_IN);

  SetHidden(false);
  if (record_tab_switch_time_request) {
    layer_tree_host_->RequestPresentationTimeForNextFrame(
        tab_switch_time_recorder_.TabWasShown(
            false /* has_saved_frames */,
            record_tab_switch_time_request.value(), show_request_timestamp));
  }

  for (auto& observer : render_frames_)
    observer.WasShown();
  if (was_evicted) {
    for (auto& observer : render_frame_proxies_)
      observer.WasEvicted();
  }
}

void RenderWidget::OnRequestSetBoundsAck() {
  DCHECK(pending_window_rect_count_);
  pending_window_rect_count_--;
}

void RenderWidget::RequestPresentation(PresentationTimeCallback callback) {
  layer_tree_host_->RequestPresentationTimeForNextFrame(std::move(callback));
  layer_tree_host_->SetNeedsCommitWithForcedRedraw();
}

void RenderWidget::RequestPresentationAfterScrollAnimationEnd(
    PresentationTimeCallback callback) {
  layer_tree_host_->RequestScrollAnimationEndNotification(
      base::BindOnce(&RenderWidget::RequestPresentation,
                     weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}

viz::FrameSinkId RenderWidget::GetFrameSinkIdAtPoint(const gfx::PointF& point,
                                                     gfx::PointF* local_point) {
  blink::WebHitTestResult result = GetHitTestResultAtPoint(point);

  blink::WebNode result_node = result.GetNode();
  *local_point = gfx::PointF(point);

  // TODO(crbug.com/797828): When the node is null the caller may
  // need to do extra checks. Like maybe update the layout and then
  // call the hit-testing API. Either way it might be better to have
  // a DCHECK for the node rather than a null check here.
  if (result_node.IsNull()) {
    return GetFrameSinkId();
  }

  viz::FrameSinkId frame_sink_id = GetRemoteFrameSinkId(result);
  if (frame_sink_id.is_valid()) {
    *local_point = gfx::PointF(result.LocalPointWithoutContentBoxOffset());
    if (compositor_deps()->IsUseZoomForDSFEnabled()) {
      *local_point = gfx::ConvertPointToDIP(
          GetOriginalScreenInfo().device_scale_factor, *local_point);
    }
    return frame_sink_id;
  }

  // Return the FrameSinkId for the current widget if the point did not hit
  // test to a remote frame, or the point is outside of the remote frame's
  // content box, or the remote frame doesn't have a valid FrameSinkId yet.
  return GetFrameSinkId();
}

bool RenderWidget::HandleInputEvent(
    const blink::WebCoalescedInputEvent& input_event,
    HandledEventCallback callback) {
  // Temporarily convert between the blink callback and the main thread
  // event queue callback. This will go away once the MainThreadEventQueue
  // moves into blink.
  WebWidget::HandledEventCallback blink_callback = base::BindOnce(
      [](HandledEventCallback callback,
         blink::mojom::InputEventResultState ack_state,
         const ui::LatencyInfo& latency_info,
         std::unique_ptr<blink::InputHandlerProxy::DidOverscrollParams>
             overscroll_params,
         base::Optional<cc::TouchAction> touch_action) {
        if (!callback)
          return;
        std::move(callback).Run(ack_state, latency_info,
                                ToOverscrollParams(overscroll_params.get()),
                                touch_action);
      },
      std::move(callback));
  webwidget_->ProcessInputEventSynchronously(input_event,
                                             std::move(blink_callback));
  return true;
}

void RenderWidget::SetNeedsMainFrame() {
  ScheduleAnimation();
}

scoped_refptr<MainThreadEventQueue> RenderWidget::GetInputEventQueue() {
  return input_event_queue_;
}

void RenderWidget::OnCursorVisibilityChange(bool is_visible) {
  GetWebWidget()->SetCursorVisibilityState(is_visible);
}

void RenderWidget::OnMouseCaptureLost() {
  GetWebWidget()->MouseCaptureLost();
}

void RenderWidget::OnSetEditCommandsForNextKeyEvent(
    std::vector<blink::mojom::EditCommandPtr> edit_commands) {
  if (auto* frame_widget = GetFrameWidget()) {
    for (auto& command : edit_commands) {
      frame_widget->AddEditCommandForNextKeyEvent(
          WebString::FromUTF8(command->name),
          WebString::FromUTF8(command->value));
    }
  }
}

void RenderWidget::OnSetActive(bool active) {
  if (delegate())
    delegate()->SetActiveForWidget(active);
}

void RenderWidget::OnSetFocus(bool enable) {
  GetWebWidget()->SetFocus(enable);
}

void RenderWidget::FocusChanged(bool enable) {
  if (delegate())
    delegate()->DidReceiveSetFocusEventForWidget();

  for (auto& observer : render_frames_)
    observer.RenderWidgetSetFocus(enable);
}

void RenderWidget::DispatchRafAlignedInput(base::TimeTicks frame_time) {
  input_event_queue_->DispatchRafAlignedInput(frame_time);
}

void RenderWidget::OnDeferMainFrameUpdatesChanged(bool deferral_state) {
  // LayerTreeHost::CreateThreaded() will defer main frame updates immediately
  // until it gets a LocalSurfaceIdAllocation. That's before the
  // |widget_input_handler_manager_| is created, so it can be null here. We
  // detect that by seeing a null LayerTreeHost.
  // TODO(schenney): To avoid ping-ponging between defer main frame states
  // during initialization, and requiring null checks here, we should probably
  // pass the LocalSurfaceIdAllocation to the compositor while it is
  // initialized so that it doesn't have to immediately switch into deferred
  // mode without being requested to.
  if (!layer_tree_host_)
    return;

  // The input handler wants to know about the mainframe update status to
  // enable/disable input and for metrics.
  widget_input_handler_manager_->OnDeferMainFrameUpdatesChanged(deferral_state);
}

void RenderWidget::OnDeferCommitsChanged(bool deferral_state) {
  // The input handler wants to know about the commit status for metric purposes
  // and to enable/disable input.
  widget_input_handler_manager_->OnDeferCommitsChanged(deferral_state);
}

void RenderWidget::RequestNewLayerTreeFrameSink(
    LayerTreeFrameSinkCallback callback) {
  // For widgets that are never visible, we don't start the compositor, so we
  // never get a request for a cc::LayerTreeFrameSink.
  DCHECK(!never_composited_);

  GURL url = GetWebWidget()->GetURLForDebugTrace();
  // The |url| is not always available, fallback to a fixed string.
  if (url.is_empty())
    url = GURL("chrome://gpu/RenderWidget::RequestNewLayerTreeFrameSink");
  // TODO(danakj): This may not be accurate, depending on the intent. A child
  // local root could be in the same process as the view, so if the client is
  // meant to designate the process type, it seems kRenderer would be the
  // correct choice. If client is meant to designate the widget type, then
  // kOOPIF would denote that it is not for the main frame. However, kRenderer
  // would also be used for other widgets such as popups.
  const char* client_name = for_child_local_root_frame_ ? kOOPIF : kRenderer;
  compositor_deps_->RequestNewLayerTreeFrameSink(
      this, frame_swap_message_queue_, std::move(url), std::move(callback),
      client_name);
}

void RenderWidget::DidCommitAndDrawCompositorFrame() {
  // NOTE: Tests may break if this event is renamed or moved. See
  // tab_capture_performancetest.cc.
  TRACE_EVENT0("gpu", "RenderWidget::DidCommitAndDrawCompositorFrame");

  for (auto& observer : render_frames_)
    observer.DidCommitAndDrawCompositorFrame();
}

void RenderWidget::DidCommitCompositorFrame(base::TimeTicks commit_start_time) {
  if (delegate())
    delegate()->DidCommitCompositorFrameForWidget();
}

void RenderWidget::DidCompletePageScaleAnimation() {
  if (delegate())
    delegate()->DidCompletePageScaleAnimationForWidget();
}

void RenderWidget::ScheduleAnimation() {
  // This call is not needed in single thread mode for tests without a
  // scheduler, but they override this method in order to schedule a synchronous
  // composite task themselves.
  layer_tree_host_->SetNeedsAnimate();
}

void RenderWidget::RecordTimeToFirstActivePaint(base::TimeDelta duration) {
  RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
  if (render_thread_impl->NeedsToRecordFirstActivePaint(TTFAP_AFTER_PURGED)) {
    UMA_HISTOGRAM_TIMES("PurgeAndSuspend.Experimental.TimeToFirstActivePaint",
                        duration);
  }
  if (render_thread_impl->NeedsToRecordFirstActivePaint(
          TTFAP_5MIN_AFTER_BACKGROUNDED)) {
    UMA_HISTOGRAM_TIMES(
        "PurgeAndSuspend.Experimental.TimeToFirstActivePaint."
        "AfterBackgrounded.5min",
        duration);
  }
}

void RenderWidget::DidHandleGestureScrollEvent(
    const blink::WebGestureEvent& gesture_event,
    const gfx::Vector2dF& unused_delta,
    const cc::OverscrollBehavior& overscroll_behavior,
    bool event_processed) {
  if (!compositor_deps_->IsElasticOverscrollEnabled())
    return;

  cc::InputHandlerScrollResult scroll_result;
  scroll_result.did_scroll = event_processed;
  scroll_result.did_overscroll_root = !unused_delta.IsZero();
  scroll_result.unused_scroll_delta = unused_delta;
  scroll_result.overscroll_behavior = overscroll_behavior;

  widget_input_handler_manager_->ObserveGestureEventOnMainThread(gesture_event,
                                                                 scroll_result);
}

void RenderWidget::DidOverscroll(const gfx::Vector2dF& overscroll_delta,
                                 const gfx::Vector2dF& accumulated_overscroll,
                                 const gfx::PointF& position_in_viewport,
                                 const gfx::Vector2dF& velocity_in_viewport,
                                 cc::OverscrollBehavior overscroll_behavior) {
  if (blink::mojom::WidgetInputHandlerHost* host =
          widget_input_handler_manager_->GetWidgetInputHandlerHost()) {
    host->DidOverscroll(blink::mojom::DidOverscrollParams::New(
        accumulated_overscroll, overscroll_delta, velocity_in_viewport,
        position_in_viewport, overscroll_behavior));
  }
}

void RenderWidget::QueueSyntheticEvent(
    std::unique_ptr<blink::WebCoalescedInputEvent> event) {
  // TODO(acomminos): If/when we add support for gesture event attribution on
  //                  the impl thread, have the caller provide attribution.
  blink::WebInputEventAttribution attribution;
  GetInputEventQueue()->HandleEvent(
      std::move(event), DISPATCH_TYPE_NON_BLOCKING,
      blink::mojom::InputEventResultState::kNotConsumed, attribution,
      HandledEventCallback());
}

void RenderWidget::GetWidgetInputHandler(
    blink::CrossVariantMojoReceiver<
        blink::mojom::WidgetInputHandlerInterfaceBase> widget_input_receiver,
    blink::CrossVariantMojoRemote<
        blink::mojom::WidgetInputHandlerHostInterfaceBase>
        widget_input_host_remote) {
  widget_input_handler_manager_->AddInterface(
      std::move(widget_input_receiver), std::move(widget_input_host_remote));
}

bool RenderWidget::HasCurrentImeGuard(bool request_to_show_virtual_keyboard) {
  if (!ime_event_guard_)
    return false;
  if (request_to_show_virtual_keyboard)
    ime_event_guard_->set_show_virtual_keyboard(true);
  return true;
}

void RenderWidget::SendCompositionRangeChanged(
    const gfx::Range& range,
    const std::vector<gfx::Rect>& character_bounds) {
  if (blink::mojom::WidgetInputHandlerHost* host =
          widget_input_handler_manager_->GetWidgetInputHandlerHost()) {
    host->ImeCompositionRangeChanged(range, character_bounds);
  }
}

bool RenderWidget::CanComposeInline() {
#if BUILDFLAG(ENABLE_PLUGINS)
  if (auto* plugin = GetFocusedPepperPluginInsideWidget())
    return plugin->IsPluginAcceptingCompositionEvents();
#endif
  return true;
}

bool RenderWidget::ShouldDispatchImeEventsToPepper() {
#if BUILDFLAG(ENABLE_PLUGINS)
  return GetFocusedPepperPluginInsideWidget();
#else
  return false;
#endif
}

blink::WebTextInputType RenderWidget::GetPepperTextInputType() {
#if BUILDFLAG(ENABLE_PLUGINS)
  return ConvertTextInputType(
      GetFocusedPepperPluginInsideWidget()->text_input_type());
#else
  NOTREACHED();
  return blink::WebTextInputType::kWebTextInputTypeNone;
#endif
}

gfx::Rect RenderWidget::GetPepperCaretBounds() {
#if BUILDFLAG(ENABLE_PLUGINS)
  blink::WebRect caret(GetFocusedPepperPluginInsideWidget()->GetCaretBounds());
  ConvertViewportToWindow(&caret);
  return caret;
#else
  NOTREACHED();
  return gfx::Rect();
#endif
}

void RenderWidget::UpdateTextInputState() {
  GetWebWidget()->UpdateTextInputState();
}

bool RenderWidget::WillHandleGestureEvent(const blink::WebGestureEvent& event) {
  possible_drag_event_info_.event_source =
      ui::DragDropTypes::DRAG_EVENT_SOURCE_TOUCH;
  possible_drag_event_info_.event_location =
      gfx::ToFlooredPoint(event.PositionInScreen());

  return false;
}

bool RenderWidget::WillHandleMouseEvent(const blink::WebMouseEvent& event) {
  for (auto& observer : render_frames_)
    observer.RenderWidgetWillHandleMouseEvent();

  possible_drag_event_info_.event_source =
      ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE;
  possible_drag_event_info_.event_location =
      gfx::Point(event.PositionInScreen().x(), event.PositionInScreen().y());

  return mouse_lock_dispatcher()->WillHandleMouseEvent(event);
}

void RenderWidget::ResizeWebWidget() {
  // In auto resize mode, blink controls sizes and RenderWidget should not be
  // passing values back in.
  DCHECK(!auto_resize_mode_);

  // The widget size given to blink is scaled by the (non-emulated,
  // see https://crbug.com/819903) device scale factor (if UseZoomForDSF is
  // enabled).
  gfx::Size size_for_blink;
  if (!compositor_deps_->IsUseZoomForDSFEnabled()) {
    size_for_blink = size_;
  } else {
    size_for_blink = gfx::ScaleToCeiledSize(
        size_, GetOriginalScreenInfo().device_scale_factor);
  }

  // The |visible_viewport_size| given to blink is scaled by the (non-emulated,
  // see https://crbug.com/819903) device scale factor (if UseZoomForDSF is
  // enabled).
  gfx::Size visible_viewport_size_for_blink;
  if (!compositor_deps_->IsUseZoomForDSFEnabled()) {
    visible_viewport_size_for_blink = visible_viewport_size_;
  } else {
    visible_viewport_size_for_blink = gfx::ScaleToCeiledSize(
        visible_viewport_size_, GetOriginalScreenInfo().device_scale_factor);
  }

  if (delegate()) {
    // When associated with a RenderView, the RenderView is in control of the
    // main frame's size, because it includes other factors for top and bottom
    // controls.
    delegate()->ResizeWebWidgetForWidget(size_for_blink,
                                         visible_viewport_size_for_blink,
                                         browser_controls_params_);
  } else {
    // Child frames set the |visible_viewport_size| on the RenderView/WebView to
    // limit the size blink tries to composite when the widget is not visible,
    // such as when it is scrolled out of the main frame's view.
    if (for_frame()) {
      RenderFrameImpl* render_frame =
          RenderFrameImpl::FromWebFrame(GetFrameWidget()->LocalRoot());
      render_frame->SetVisibleViewportSizeForChildLocalRootOnRenderView(
          visible_viewport_size_for_blink);
    }

    // For child frame widgets, popups, and pepper, the RenderWidget is in
    // control of the WebWidget's size.
    GetWebWidget()->Resize(size_for_blink);
  }
}

gfx::Rect RenderWidget::CompositorViewportRect() const {
  return layer_tree_host_->device_viewport_rect();
}

void RenderWidget::SetScreenInfoAndSize(
    const ScreenInfo& screen_info,
    const gfx::Size& widget_size,
    const gfx::Size& visible_viewport_size) {
  // Emulation only happens on the main frame.
  DCHECK(delegate());
  DCHECK(for_frame());
  // Emulation happens on regular main frames which don't use auto-resize mode.
  DCHECK(!auto_resize_mode_);

  UpdateSurfaceAndScreenInfo(local_surface_id_allocation_from_parent_,
                             CompositorViewportRect(), screen_info);

  RenderFrameImpl* render_frame =
      RenderFrameImpl::FromWebFrame(GetFrameWidget()->LocalRoot());
  // UpdateSurfaceAndScreenInfo() changes properties including the device scale
  // factor, which changes PreferCompositingToLCDText decisions.
  // TODO(danakj): Do this in UpdateSurfaceAndScreenInfo? But requires a Resize
  // to happen after (see comment on
  // SetPreferCompositingToLCDTextEnabledOnRenderView).
  //
  // This causes compositing state to be modified which dirties the document
  // lifecycle. Android Webview relies on the document lifecycle being clean
  // after the RenderWidget is initialized, in order to send IPCs that query
  // and change compositing state. So ResizeWebWidget() must come after this
  // call, as it runs the entire document lifecycle.
  render_frame->SetPreferCompositingToLCDTextEnabledOnRenderView(
      ComputePreferCompositingToLCDText(compositor_deps_,
                                        screen_info_.device_scale_factor));

  visible_viewport_size_ = visible_viewport_size;
  size_ = widget_size;
  ResizeWebWidget();
}

void RenderWidget::SetScreenMetricsEmulationParameters(
    bool enabled,
    const blink::WebDeviceEmulationParams& params) {
  // This is only supported in RenderView, which has an delegate().
  DCHECK(delegate());
  delegate()->SetScreenMetricsEmulationParametersForWidget(enabled, params);
}

void RenderWidget::SetScreenRects(const gfx::Rect& widget_screen_rect,
                                  const gfx::Rect& window_screen_rect) {
  widget_screen_rect_ = widget_screen_rect;
  window_screen_rect_ = window_screen_rect;
}

///////////////////////////////////////////////////////////////////////////////
// WebWidgetClient

void RenderWidget::DidMeaningfulLayout(blink::WebMeaningfulLayout layout_type) {
  for (auto& observer : render_frames_)
    observer.DidMeaningfulLayout(layout_type);
}

// static
std::unique_ptr<cc::SwapPromise> RenderWidget::QueueMessageImpl(
    std::unique_ptr<IPC::Message> msg,
    FrameSwapMessageQueue* frame_swap_message_queue,
    scoped_refptr<IPC::SyncMessageFilter> sync_message_filter,
    int source_frame_number) {
  bool first_message_for_frame = false;
  frame_swap_message_queue->QueueMessageForFrame(
      source_frame_number, std::move(msg), &first_message_for_frame);
  if (!first_message_for_frame)
    return nullptr;
  return std::make_unique<QueueMessageSwapPromise>(
      sync_message_filter, frame_swap_message_queue, source_frame_number);
}

void RenderWidget::SetHandlingInputEvent(bool handling_input_event) {
  GetWebWidget()->SetHandlingInputEvent(handling_input_event);
}

void RenderWidget::QueueMessage(std::unique_ptr<IPC::Message> msg) {
  // RenderThreadImpl::current() is NULL in some tests.
  if (!RenderThreadImpl::current()) {
    Send(msg.release());
    return;
  }

  std::unique_ptr<cc::SwapPromise> swap_promise =
      QueueMessageImpl(std::move(msg), frame_swap_message_queue_.get(),
                       RenderThreadImpl::current()->sync_message_filter(),
                       layer_tree_host_->SourceFrameNumber());
  if (swap_promise) {
    layer_tree_host_->QueueSwapPromise(std::move(swap_promise));

    // Request a main frame if one is not already in progress. This might either
    // A) request a commit ahead of time or B) request a commit which is not
    // needed because there are not pending updates. If B) then the frame will
    // be aborted early and the swap promises will be broken (see
    // EarlyOut_NoUpdates).
    layer_tree_host_->SetNeedsAnimateIfNotInsideMainFrame();
  }
}

// We are supposed to get a single call to Show for a newly created RenderWidget
// that was created via RenderWidget::CreateWebView.  So, we wait until this
// point to dispatch the ShowWidget message.
//
// This method provides us with the information about how to display the newly
// created RenderWidget (i.e., as a blocked popup or as a new tab).
//
void RenderWidget::Show(WebNavigationPolicy policy) {
  if (!show_callback_) {
    if (delegate()) {
      // When SupportsMultipleWindows is disabled, popups are reusing
      // the view's RenderWidget. In some scenarios, this makes blink to call
      // Show() twice. But otherwise, if it is enabled, we should not visit
      // Show() more than once.
      DCHECK(!delegate()->SupportsMultipleWindowsForWidget());
      return;
    } else {
      NOTREACHED() << "received extraneous Show call";
    }
  }

  DCHECK(routing_id_ != MSG_ROUTING_NONE);

  // The opener is responsible for actually showing this widget.
  std::move(show_callback_).Run(this, policy, initial_rect_);

  // NOTE: initial_rect_ may still have its default values at this point, but
  // that's okay.  It'll be ignored if as_popup is false, or the browser
  // process will impose a default position otherwise.
  SetPendingWindowRect(initial_rect_);
}

void RenderWidget::InitCompositing(const ScreenInfo& screen_info) {
  TRACE_EVENT0("blink", "RenderWidget::InitializeLayerTreeView");

  layer_tree_host_ = webwidget_->InitializeCompositing(
      compositor_deps_->GetTaskGraphRunner(),
      GenerateLayerTreeSettings(compositor_deps_, for_child_local_root_frame_,
                                screen_info.rect.size(),
                                screen_info.device_scale_factor),
      compositor_deps_->CreateUkmRecorderFactory());
  DCHECK(layer_tree_host_);
  blink::scheduler::WebThreadScheduler* main_thread_scheduler =
      compositor_deps_->GetWebMainThreadScheduler();

  widget_scheduler_ = main_thread_scheduler->CreateWidgetScheduler();

  blink::scheduler::WebThreadScheduler* compositor_thread_scheduler =
      blink::scheduler::WebThreadScheduler::CompositorThreadScheduler();
  scoped_refptr<base::SingleThreadTaskRunner> compositor_input_task_runner;
  // Use the compositor thread task runner unless this is a popup or other such
  // non-frame widgets. The |compositor_thread_scheduler| can be null in tests
  // without a compositor thread.
  if (for_frame() && compositor_thread_scheduler) {
    compositor_input_task_runner =
        compositor_thread_scheduler->DefaultTaskRunner();
  }

  input_event_queue_ = base::MakeRefCounted<MainThreadEventQueue>(
      this, widget_scheduler_->InputTaskRunner(), main_thread_scheduler,
      /*allow_raf_aligned_input=*/!never_composited_);

  // We only use an external input handler for frame RenderWidgets because only
  // frames use the compositor for input handling. Other kinds of RenderWidgets
  // (e.g.  popups, plugins) must forward their input directly through
  // RenderWidgetInputHandler into Blink.
  bool uses_input_handler = for_frame();
  widget_input_handler_manager_ = WidgetInputHandlerManager::Create(
      weak_ptr_factory_.GetWeakPtr(), std::move(compositor_input_task_runner),
      main_thread_scheduler, uses_input_handler);
  const base::CommandLine& command_line =
      *base::CommandLine::ForCurrentProcess();
  if (command_line.HasSwitch(blink::switches::kAllowPreCommitInput))
    widget_input_handler_manager_->AllowPreCommitInput();
}

// static
void RenderWidget::DoDeferredClose(int widget_routing_id) {
  // DoDeferredClose() was a posted task, which means the RenderWidget may have
  // been destroyed in the meantime. So break the dependency on RenderWidget
  // here, by making this method static and going to RenderThread directly to
  // send.
  RenderThread::Get()->Send(new WidgetHostMsg_Close(widget_routing_id));
}

void RenderWidget::ClosePopupWidgetSoon() {
  // Only should be called for popup widgets.
  DCHECK(!for_child_local_root_frame_);
  DCHECK(!delegate_);

  CloseWidgetSoon();
}

void RenderWidget::CloseWidgetSoon() {
  DCHECK(RenderThread::IsMainThread());

  // If a page calls window.close() twice, we'll end up here twice, but that's
  // OK.  It is safe to send multiple Close messages.
  //
  // Ask the RenderWidgetHost to initiate close.  We could be called from deep
  // in Javascript.  If we ask the RenderWidgetHost to close now, the window
  // could be closed before the JS finishes executing, thanks to nested message
  // loops running and handling the resuliting Close IPC. So instead, post a
  // message back to the message loop, which won't run until the JS is
  // complete, and then the Close request can be sent.
  compositor_deps_->GetCleanupTaskRunner()->PostTask(
      FROM_HERE, base::BindOnce(&RenderWidget::DoDeferredClose, routing_id_));
}

void RenderWidget::Close(std::unique_ptr<RenderWidget> widget) {
  // At the end of this method, |widget| which points to this is deleted.
  DCHECK_EQ(widget.get(), this);
  DCHECK(RenderThread::IsMainThread());
  DCHECK(!closing_);

  closing_ = true;

  // Browser correspondence is no longer needed at this point.
  if (routing_id_ != MSG_ROUTING_NONE) {
    RenderThread::Get()->RemoveRoute(routing_id_);
  }

  // The |input_event_queue_| is refcounted and will live while an event is
  // being handled. This drops the connection back to this RenderWidget which
  // is being destroyed.
  input_event_queue_->ClearClient();

  // The |widget_input_handler_manager_| needs to outlive the LayerTreeHost,
  // which is destroyed asynchronously by Close(). We pass ownership of it to
  // Close() for it to destroy the LayerTreeHost and
  // |widget_input_handler_manager_| together on the cleanup TaskRunner.
  webwidget_->Close(
      compositor_deps_->GetCleanupTaskRunner(),
      base::BindOnce([](scoped_refptr<WidgetInputHandlerManager> manager) {},
                     std::move(widget_input_handler_manager_)));
  webwidget_ = nullptr;

  // |layer_tree_host_| is valid only when |webwidget_| is valid. Close may
  // use the WebWidgetClient while unloading the Frame so we clear this
  // after.
  layer_tree_host_ = nullptr;

  // Note the ACK is a control message going to the RenderProcessHost.
  RenderThread::Get()->Send(new WidgetHostMsg_Close_ACK(routing_id()));
}

blink::WebFrameWidget* RenderWidget::GetFrameWidget() const {
  // TODO(danakj): Remove this check and don't call this method for non-frames.
  if (!for_frame())
    return nullptr;
  return static_cast<blink::WebFrameWidget*>(webwidget_);
}

bool RenderWidget::IsForProvisionalFrame() const {
  if (!for_frame())
    return false;
  // No widget here means the main frame is remote and there is no
  // provisional frame at the moment.
  if (!webwidget_)
    return false;
  auto* frame_widget = static_cast<blink::WebFrameWidget*>(webwidget_);
  return frame_widget->LocalRoot()->IsProvisional();
}

void RenderWidget::ScreenRectToEmulated(gfx::Rect* screen_rect) const {
  screen_rect->set_x(
      opener_widget_screen_origin_.x() +
      (screen_rect->x() - opener_original_widget_screen_origin_.x()) /
          opener_emulator_scale_);
  screen_rect->set_y(
      opener_widget_screen_origin_.y() +
      (screen_rect->y() - opener_original_widget_screen_origin_.y()) /
          opener_emulator_scale_);
}

void RenderWidget::EmulatedToScreenRect(gfx::Rect* screen_rect) const {
  screen_rect->set_x(opener_original_widget_screen_origin_.x() +
                     (screen_rect->x() - opener_widget_screen_origin_.x()) *
                         opener_emulator_scale_);
  screen_rect->set_y(opener_original_widget_screen_origin_.y() +
                     (screen_rect->y() - opener_widget_screen_origin_.y()) *
                         opener_emulator_scale_);
}

blink::WebScreenInfo RenderWidget::GetScreenInfo() {
  const ScreenInfo& info = screen_info_;

  blink::WebScreenInfo web_screen_info;
  web_screen_info.device_scale_factor = info.device_scale_factor;
  web_screen_info.color_space = info.color_space;
  web_screen_info.depth = info.depth;
  web_screen_info.depth_per_component = info.depth_per_component;
  web_screen_info.is_monochrome = info.is_monochrome;
  web_screen_info.rect = blink::WebRect(info.rect);
  web_screen_info.available_rect = blink::WebRect(info.available_rect);
  switch (info.orientation_type) {
    case SCREEN_ORIENTATION_VALUES_PORTRAIT_PRIMARY:
      web_screen_info.orientation_type =
          blink::kWebScreenOrientationPortraitPrimary;
      break;
    case SCREEN_ORIENTATION_VALUES_PORTRAIT_SECONDARY:
      web_screen_info.orientation_type =
          blink::kWebScreenOrientationPortraitSecondary;
      break;
    case SCREEN_ORIENTATION_VALUES_LANDSCAPE_PRIMARY:
      web_screen_info.orientation_type =
          blink::kWebScreenOrientationLandscapePrimary;
      break;
    case SCREEN_ORIENTATION_VALUES_LANDSCAPE_SECONDARY:
      web_screen_info.orientation_type =
          blink::kWebScreenOrientationLandscapeSecondary;
      break;
    default:
      web_screen_info.orientation_type = blink::kWebScreenOrientationUndefined;
      break;
  }
  web_screen_info.orientation_angle = info.orientation_angle;

  return web_screen_info;
}

WebRect RenderWidget::WindowRect() {
  gfx::Rect rect;
  if (pending_window_rect_count_) {
    // NOTE(mbelshe): If there is a pending_window_rect_, then getting
    // the RootWindowRect is probably going to return wrong results since the
    // browser may not have processed the Move yet.  There isn't really anything
    // good to do in this case, and it shouldn't happen - since this size is
    // only really needed for windowToScreen, which is only used for Popups.
    rect = pending_window_rect_;
  } else {
    rect = window_screen_rect_;
  }

  // Popup widgets aren't emulated, but the WindowRect (aka WindowScreenRect)
  // given to them should be.
  if (opener_emulator_scale_) {
    DCHECK(popup_);
    ScreenRectToEmulated(&rect);
  }
  return rect;
}

WebRect RenderWidget::ViewRect() {
  gfx::Rect rect = widget_screen_rect_;

  // Popup widgets aren't emulated, but the ViewRect (aka WidgetScreenRect)
  // given to them should be.
  if (opener_emulator_scale_) {
    DCHECK(popup_);
    ScreenRectToEmulated(&rect);
  }
  return rect;
}

void RenderWidget::SetWindowRect(const WebRect& rect_in_screen) {
  // This path is for the renderer to change the on-screen position/size of
  // the widget by changing its window rect. This is not possible for
  // RenderWidgets whose position/size are controlled by layout from another
  // frame tree (ie. child local root frames), as the window rect can only be
  // set by the browser.
  if (for_child_local_root_frame_)
    return;

  gfx::Rect window_rect = rect_in_screen;

  // Popups aren't emulated, but the WidgetScreenRect and WindowScreenRect
  // given to them are. When they set the WindowScreenRect it is based on those
  // emulated values, so we reverse the emulation.
  if (opener_emulator_scale_) {
    DCHECK(popup_);
    EmulatedToScreenRect(&window_rect);
  }

  if (synchronous_resize_mode_for_testing_) {
    // This is a web-test-only path. At one point, it was planned to be
    // removed. See https://crbug.com/309760.
    SetWindowRectSynchronously(window_rect);
    return;
  }

  if (show_callback_) {
    // The widget is not shown yet. Delay the |window_rect| being sent to the
    // browser until Show() is called so it can be sent with that IPC, once the
    // browser is ready for the info.
    initial_rect_ = window_rect;
  } else {
    Send(new WidgetHostMsg_RequestSetBounds(routing_id_, window_rect));
    SetPendingWindowRect(window_rect);
  }
}

void RenderWidget::SetPendingWindowRect(const WebRect& rect) {
  pending_window_rect_ = rect;
  pending_window_rect_count_++;

  // Popups don't get size updates back from the browser so just store the set
  // values.
  if (!for_frame()) {
    window_screen_rect_ = rect;
    widget_screen_rect_ = rect;
  }
}

void RenderWidget::OnShowContextMenu(ui::MenuSourceType source_type,
                                     const gfx::Point& location) {
  has_host_context_menu_location_ = true;
  host_context_menu_location_ = location;
  GetWebWidget()->ShowContextMenu(
      static_cast<blink::WebMenuSourceType>(source_type));
  has_host_context_menu_location_ = false;
}

void RenderWidget::OnImeSetComposition(
    const base::string16& text,
    const std::vector<ui::ImeTextSpan>& ime_text_spans,
    const gfx::Range& replacement_range,
    int selection_start,
    int selection_end) {
  if (!ShouldHandleImeEvents())
    return;

#if BUILDFLAG(ENABLE_PLUGINS)
  if (auto* plugin = GetFocusedPepperPluginInsideWidget()) {
    plugin->render_frame()->OnImeSetComposition(text, ime_text_spans,
                                                selection_start, selection_end);
    return;
  }
#endif
  ImeEventGuard guard(weak_ptr_factory_.GetWeakPtr());
  blink::WebInputMethodController* controller = GetInputMethodController();
  if (!controller ||
      !controller->SetComposition(
          WebString::FromUTF16(text),
          WebVector<ui::ImeTextSpan>(ime_text_spans),
          replacement_range.IsValid()
              ? WebRange(replacement_range.start(), replacement_range.length())
              : WebRange(),
          selection_start, selection_end)) {
    // If we failed to set the composition text, then we need to let the browser
    // process to cancel the input method's ongoing composition session, to make
    // sure we are in a consistent state.
    if (blink::mojom::WidgetInputHandlerHost* host =
            widget_input_handler_manager_->GetWidgetInputHandlerHost()) {
      host->ImeCancelComposition();
    }
  }
  UpdateCompositionInfo();
}

void RenderWidget::OnImeCommitText(
    const base::string16& text,
    const std::vector<ui::ImeTextSpan>& ime_text_spans,
    const gfx::Range& replacement_range,
    int relative_cursor_pos) {
  if (!ShouldHandleImeEvents())
    return;

#if BUILDFLAG(ENABLE_PLUGINS)
  if (auto* plugin = GetFocusedPepperPluginInsideWidget()) {
    plugin->render_frame()->OnImeCommitText(text, replacement_range,
                                            relative_cursor_pos);
    return;
  }
#endif
  ImeEventGuard guard(weak_ptr_factory_.GetWeakPtr());
  GetWebWidget()->SetHandlingInputEvent(true);
  if (auto* controller = GetInputMethodController()) {
    controller->CommitText(
        WebString::FromUTF16(text), WebVector<ui::ImeTextSpan>(ime_text_spans),
        replacement_range.IsValid()
            ? WebRange(replacement_range.start(), replacement_range.length())
            : WebRange(),
        relative_cursor_pos);
  }
  GetWebWidget()->SetHandlingInputEvent(false);
  UpdateCompositionInfo();
}

void RenderWidget::OnImeFinishComposingText(bool keep_selection) {
  if (!ShouldHandleImeEvents())
    return;

#if BUILDFLAG(ENABLE_PLUGINS)
  if (auto* plugin = GetFocusedPepperPluginInsideWidget()) {
    plugin->render_frame()->OnImeFinishComposingText(keep_selection);
    return;
  }
#endif

  ImeEventGuard guard(weak_ptr_factory_.GetWeakPtr());
  GetWebWidget()->SetHandlingInputEvent(true);
  if (auto* controller = GetInputMethodController()) {
    controller->FinishComposingText(
        keep_selection ? WebInputMethodController::kKeepSelection
                       : WebInputMethodController::kDoNotKeepSelection);
  }
  GetWebWidget()->SetHandlingInputEvent(false);
  UpdateCompositionInfo();
}

void RenderWidget::OnRequestTextInputStateUpdate() {
  GetWebWidget()->ForceTextInputStateUpdate();
}

void RenderWidget::OnRequestCompositionUpdates(bool immediate_request,
                                               bool monitor_updates) {
  GetWebWidget()->RequestCompositionUpdates(immediate_request, monitor_updates);
}

void RenderWidget::UpdateSurfaceAndScreenInfo(
    const viz::LocalSurfaceIdAllocation& new_local_surface_id_allocation,
    const gfx::Rect& compositor_viewport_pixel_rect,
    const ScreenInfo& new_screen_info) {
  // Same logic is used in RenderWidgetHostImpl::SynchronizeVisualProperties to
  // detect if there is a screen orientation change.
  bool orientation_changed =
      screen_info_.orientation_angle != new_screen_info.orientation_angle ||
      screen_info_.orientation_type != new_screen_info.orientation_type;
  ScreenInfo previous_original_screen_info = GetOriginalScreenInfo();

  local_surface_id_allocation_from_parent_ = new_local_surface_id_allocation;
  screen_info_ = new_screen_info;

  // Note carefully that the DSF specified in |new_screen_info| is not the
  // DSF used by the compositor during device emulation!
  layer_tree_host_->SetViewportRectAndScale(
      compositor_viewport_pixel_rect,
      GetOriginalScreenInfo().device_scale_factor,
      local_surface_id_allocation_from_parent_);
  // The ViewportVisibleRect derives from the LayerTreeView's viewport size,
  // which is set above.
  layer_tree_host_->SetViewportVisibleRect(ViewportVisibleRect());
  layer_tree_host_->SetRasterColorSpace(
      screen_info_.color_space.GetRasterColorSpace());

  if (orientation_changed)
    OnOrientationChange();

  if (for_frame()) {
    RenderFrameImpl* render_frame =
        RenderFrameImpl::FromWebFrame(GetFrameWidget()->LocalRoot());
    // TODO(danakj): RenderWidget knows the DSF and could avoid calling into
    // blink when it hasn't changed, but it sets an initial |screen_info_|
    // during construction, so it is hard to tell if the value is not the
    // default value once we get to OnSynchronizeVisualProperties. Thus we
    // call into blink unconditionally and let it early out if it's already
    // set.
    render_frame->SetDeviceScaleFactorOnRenderView(
        compositor_deps_->IsUseZoomForDSFEnabled(),
        screen_info_.device_scale_factor);
    // When the device scale changes, the size and position of the popup would
    // need to be adjusted, which we can't do. Just close the popup, which is
    // also consistent with page zoom and resize behavior.
    if (previous_original_screen_info.device_scale_factor !=
        screen_info_.device_scale_factor) {
      blink::WebView* web_view = GetFrameWidget()->LocalRoot()->View();
      web_view->CancelPagePopup();
    }
  }

  // Propagate changes down to child local root RenderWidgets and BrowserPlugins
  // in other frame trees/processes.
  if (previous_original_screen_info != GetOriginalScreenInfo()) {
    for (auto& observer : render_frame_proxies_)
      observer.OnScreenInfoChanged(GetOriginalScreenInfo());
  }
}

void RenderWidget::SetWindowRectSynchronously(
    const gfx::Rect& new_window_rect) {
  // This method is only call in tests, and it applies the |new_window_rect| to
  // all three of:
  // a) widget size (in |size_|)
  // b) blink viewport (in |visible_viewport_size_|)
  // c) compositor viewport (in cc::LayerTreeHost)
  // Normally the browser controls these three things independently, but this is
  // used in tests to control the size from the renderer.

  // We are resizing the window from the renderer, so allocate a new
  // viz::LocalSurfaceId to avoid surface invariants violations in tests.
  layer_tree_host_->RequestNewLocalSurfaceId();

  gfx::Rect compositor_viewport_pixel_rect(gfx::ScaleToCeiledSize(
      new_window_rect.size(), screen_info_.device_scale_factor));
  UpdateSurfaceAndScreenInfo(local_surface_id_allocation_from_parent_,
                             compositor_viewport_pixel_rect, screen_info_);

  visible_viewport_size_ = new_window_rect.size();
  size_ = new_window_rect.size();
  ResizeWebWidget();

  widget_screen_rect_ = new_window_rect;
  window_screen_rect_ = new_window_rect;
  if (show_callback_) {
    // Tests may call here directly to control the window rect. If
    // Show() did not happen yet, the rect is stored to be passed to the
    // browser when the RenderWidget requests Show().
    initial_rect_ = new_window_rect;
  }
}

void RenderWidget::OnUpdateScreenRects(const gfx::Rect& widget_screen_rect,
                                       const gfx::Rect& window_screen_rect) {
  if (device_emulator_) {
    device_emulator_->OnUpdateScreenRects(widget_screen_rect,
                                          window_screen_rect);
  } else {
    SetScreenRects(widget_screen_rect, window_screen_rect);
  }
  Send(new WidgetHostMsg_UpdateScreenRects_ACK(routing_id()));
}

void RenderWidget::OnSetViewportIntersection(
    const blink::ViewportIntersectionState& intersection_state) {
  if (auto* frame_widget = GetFrameWidget()) {
    compositor_visible_rect_ = intersection_state.compositor_visible_rect;
    frame_widget->SetRemoteViewportIntersection(intersection_state);
    layer_tree_host_->SetViewportVisibleRect(ViewportVisibleRect());
  }
}

void RenderWidget::OnDragTargetDragEnter(
    const std::vector<DropData::Metadata>& drop_meta_data,
    const gfx::PointF& client_point,
    const gfx::PointF& screen_point,
    WebDragOperationsMask ops,
    int key_modifiers) {
  blink::WebFrameWidget* frame_widget = GetFrameWidget();
  if (!frame_widget)
    return;

  WebDragOperation operation = frame_widget->DragTargetDragEnter(
      DropMetaDataToWebDragData(drop_meta_data), client_point, screen_point,
      ops, key_modifiers);

  Send(new DragHostMsg_UpdateDragCursor(routing_id(), operation));
}

void RenderWidget::OnDragTargetDrop(const DropData& drop_data,
                                    const gfx::PointF& client_point,
                                    const gfx::PointF& screen_point,
                                    int key_modifiers) {
  blink::WebFrameWidget* frame_widget = GetFrameWidget();
  if (!frame_widget)
    return;

  frame_widget->DragTargetDrop(DropDataToWebDragData(drop_data),
                               ConvertWindowPointToViewport(client_point),
                               screen_point, key_modifiers);
}

void RenderWidget::ConvertViewportToWindow(blink::WebRect* rect) {
  if (compositor_deps_->IsUseZoomForDSFEnabled()) {
    float reverse = 1 / GetOriginalScreenInfo().device_scale_factor;
    // TODO(oshima): We may need to allow pixel precision here as the the
    // anchor element can be placed at half pixel.
    gfx::Rect window_rect = gfx::ScaleToEnclosedRect(gfx::Rect(*rect), reverse);
    rect->x = window_rect.x();
    rect->y = window_rect.y();
    rect->width = window_rect.width();
    rect->height = window_rect.height();
  }
}

void RenderWidget::ConvertViewportToWindow(blink::WebFloatRect* rect) {
  if (compositor_deps_->IsUseZoomForDSFEnabled()) {
    rect->x /= GetOriginalScreenInfo().device_scale_factor;
    rect->y /= GetOriginalScreenInfo().device_scale_factor;
    rect->width /= GetOriginalScreenInfo().device_scale_factor;
    rect->height /= GetOriginalScreenInfo().device_scale_factor;
  }
}

void RenderWidget::ConvertWindowToViewport(blink::WebFloatRect* rect) {
  if (compositor_deps_->IsUseZoomForDSFEnabled()) {
    rect->x *= GetOriginalScreenInfo().device_scale_factor;
    rect->y *= GetOriginalScreenInfo().device_scale_factor;
    rect->width *= GetOriginalScreenInfo().device_scale_factor;
    rect->height *= GetOriginalScreenInfo().device_scale_factor;
  }
}

void RenderWidget::OnOrientationChange() {
  if (auto* frame_widget = GetFrameWidget()) {
    // LocalRoot() might return null for provisional main frames. In this case,
    // the frame hasn't committed a navigation and is not swapped into the tree
    // yet, so it doesn't make sense to send orientation change events to it.
    //
    // TODO(https://crbug.com/578349): This check should be cleaned up
    // once provisional frames are gone.
    if (frame_widget->LocalRoot())
      frame_widget->LocalRoot()->SendOrientationChangeEvent();
  }
}

void RenderWidget::SetHidden(bool hidden) {
  // A provisional frame widget will never be shown or hidden, as the frame must
  // be attached to the frame tree before changing visibility.
  DCHECK(!IsForProvisionalFrame());

  if (is_hidden_ == hidden)
    return;

  // The status has changed.  Tell the RenderThread about it and ensure
  // throttled acks are released in case frame production ceases.
  is_hidden_ = hidden;

  if (auto* scheduler_state = GetWebWidget()->RendererWidgetSchedulingState())
    scheduler_state->SetHidden(hidden);

  // If the renderer was hidden, resolve any pending synthetic gestures so they
  // aren't blocked waiting for a compositor frame to be generated.
  if (is_hidden_)
    widget_input_handler_manager_->InvokeInputProcessedCallback();

  if (!never_composited_)
    webwidget_->SetCompositorVisible(!is_hidden_);
}

void RenderWidget::OnImeEventGuardStart(ImeEventGuard* guard) {
  if (!ime_event_guard_)
    ime_event_guard_ = guard;
}

void RenderWidget::OnImeEventGuardFinish(ImeEventGuard* guard) {
  if (ime_event_guard_ != guard)
    return;
  ime_event_guard_ = nullptr;

  // While handling an ime event, text input state and selection bounds updates
  // are ignored. These must explicitly be updated once finished handling the
  // ime event.
  UpdateSelectionBounds();
#if defined(OS_ANDROID)
  if (guard->show_virtual_keyboard())
    GetWebWidget()->ShowVirtualKeyboard();
  else
    UpdateTextInputState();
#endif
}

void RenderWidget::UpdateSelectionBounds() {
  GetWebWidget()->UpdateSelectionBounds();
}

void RenderWidget::UpdateCompositionInfo() {
  GetWebWidget()->UpdateCompositionInfo();
}

void RenderWidget::DidAutoResize(const gfx::Size& new_size) {
  WebRect new_size_in_window(0, 0, new_size.width(), new_size.height());
  ConvertViewportToWindow(&new_size_in_window);
  if (size_.width() != new_size_in_window.width ||
      size_.height() != new_size_in_window.height) {
    size_ = gfx::Size(new_size_in_window.width, new_size_in_window.height);

    if (synchronous_resize_mode_for_testing_) {
      gfx::Rect new_pos(WindowRect().x, WindowRect().y, size_.width(),
                        size_.height());
      widget_screen_rect_ = new_pos;
      window_screen_rect_ = new_pos;
    }

    // TODO(ccameron): Note that this destroys any information differentiating
    // |size_| from the compositor's viewport size. Also note that the
    // calculation of |new_compositor_viewport_pixel_rect| does not appear to
    // take into account device emulation.
    layer_tree_host_->RequestNewLocalSurfaceId();
    gfx::Rect new_compositor_viewport_pixel_rect = gfx::Rect(
        gfx::ScaleToCeiledSize(size_, screen_info_.device_scale_factor));
    UpdateSurfaceAndScreenInfo(local_surface_id_allocation_from_parent_,
                               new_compositor_viewport_pixel_rect,
                               screen_info_);
  }
}

// static
cc::LayerTreeSettings RenderWidget::GenerateLayerTreeSettings(
    CompositorDependencies* compositor_deps,
    bool is_for_subframe,
    const gfx::Size& initial_screen_size,
    float initial_device_scale_factor) {
  const bool is_threaded = !compositor_deps->IsSingleThreaded();

  const base::CommandLine& cmd = *base::CommandLine::ForCurrentProcess();
  cc::LayerTreeSettings settings;

  settings.enable_synchronized_scrolling =
      base::FeatureList::IsEnabled(features::kSynchronizedScrolling);
  settings.use_zoom_for_dsf = compositor_deps->IsUseZoomForDSFEnabled();
  settings.percent_based_scrolling =
      base::FeatureList::IsEnabled(features::kPercentBasedScrolling);
  settings.compositor_threaded_scrollbar_scrolling =
      base::FeatureList::IsEnabled(
          features::kCompositorThreadedScrollbarScrolling);

  settings.resource_settings.use_r16_texture =
      base::FeatureList::IsEnabled(media::kUseR16Texture);

  settings.commit_to_active_tree = !is_threaded;
  settings.is_layer_tree_for_subframe = is_for_subframe;

  settings.main_frame_before_activation_enabled =
      cmd.HasSwitch(cc::switches::kEnableMainFrameBeforeActivation);

  // Checkerimaging is not supported for synchronous single-threaded mode, which
  // is what the renderer uses if its not threaded.
  settings.enable_checker_imaging =
      !cmd.HasSwitch(cc::switches::kDisableCheckerImaging) && is_threaded;

#if defined(OS_ANDROID)
  // WebView should always raster in the default color space.
  // Synchronous compositing indicates WebView.
  if (!compositor_deps->UsingSynchronousCompositing())
    settings.prefer_raster_in_srgb = features::IsDynamicColorGamutEnabled();

  // We can use a more aggressive limit on Android since decodes tend to take
  // longer on these devices.
  settings.min_image_bytes_to_checker = 512 * 1024;  // 512kB

  // Re-rasterization of checker-imaged content with software raster can be too
  // costly on Android.
  settings.only_checker_images_with_gpu_raster = true;
#endif

  auto switch_value_as_int = [](const base::CommandLine& command_line,
                                const std::string& switch_string, int min_value,
                                int max_value, int* result) {
    std::string string_value = command_line.GetSwitchValueASCII(switch_string);
    int int_value;
    if (base::StringToInt(string_value, &int_value) && int_value >= min_value &&
        int_value <= max_value) {
      *result = int_value;
      return true;
    } else {
      DLOG(WARNING) << "Failed to parse switch " << switch_string << ": "
                    << string_value;
      return false;
    }
  };

  int default_tile_size = 256;
#if defined(OS_ANDROID)
  const gfx::Size screen_size =
      gfx::ScaleToFlooredSize(initial_screen_size, initial_device_scale_factor);
  int display_width = screen_size.width();
  int display_height = screen_size.height();
  int numTiles = (display_width * display_height) / (256 * 256);
  if (numTiles > 16)
    default_tile_size = 384;
  if (numTiles >= 40)
    default_tile_size = 512;

  // Adjust for some resolutions that barely straddle an extra
  // tile when in portrait mode. This helps worst case scroll/raster
  // by not needing a full extra tile for each row.
  constexpr int tolerance = 10;  // To avoid rounding errors.
  int portrait_width = std::min(display_width, display_height);
  if (default_tile_size == 256 && std::abs(portrait_width - 768) < tolerance)
    default_tile_size += 32;
  if (default_tile_size == 384 && std::abs(portrait_width - 1200) < tolerance)
    default_tile_size += 32;
#elif defined(OS_CHROMEOS) || defined(OS_MACOSX)
  // Use 512 for high DPI (dsf=2.0f) devices.
  if (initial_device_scale_factor >= 2.0f)
    default_tile_size = 512;
#endif

  // TODO(danakj): This should not be a setting O_O; it should change when the
  // device scale factor on LayerTreeHost changes.
  settings.default_tile_size = gfx::Size(default_tile_size, default_tile_size);
  if (cmd.HasSwitch(blink::switches::kDefaultTileWidth)) {
    int tile_width = 0;
    switch_value_as_int(cmd, blink::switches::kDefaultTileWidth, 1,
                        std::numeric_limits<int>::max(), &tile_width);
    settings.default_tile_size.set_width(tile_width);
  }
  if (cmd.HasSwitch(blink::switches::kDefaultTileHeight)) {
    int tile_height = 0;
    switch_value_as_int(cmd, blink::switches::kDefaultTileHeight, 1,
                        std::numeric_limits<int>::max(), &tile_height);
    settings.default_tile_size.set_height(tile_height);
  }

  if (cmd.HasSwitch(blink::switches::kMinHeightForGpuRasterTile)) {
    int min_height_for_gpu_raster_tile = 0;
    switch_value_as_int(cmd, blink::switches::kMinHeightForGpuRasterTile, 1,
                        std::numeric_limits<int>::max(),
                        &min_height_for_gpu_raster_tile);
    settings.min_height_for_gpu_raster_tile = min_height_for_gpu_raster_tile;
  }

  int max_untiled_layer_width = settings.max_untiled_layer_size.width();
  if (cmd.HasSwitch(blink::switches::kMaxUntiledLayerWidth)) {
    switch_value_as_int(cmd, blink::switches::kMaxUntiledLayerWidth, 1,
                        std::numeric_limits<int>::max(),
                        &max_untiled_layer_width);
  }
  int max_untiled_layer_height = settings.max_untiled_layer_size.height();
  if (cmd.HasSwitch(blink::switches::kMaxUntiledLayerHeight)) {
    switch_value_as_int(cmd, blink::switches::kMaxUntiledLayerHeight, 1,
                        std::numeric_limits<int>::max(),
                        &max_untiled_layer_height);
  }

  settings.max_untiled_layer_size =
      gfx::Size(max_untiled_layer_width, max_untiled_layer_height);

  settings.gpu_rasterization_msaa_sample_count =
      compositor_deps->GetGpuRasterizationMSAASampleCount();

  settings.can_use_lcd_text = compositor_deps->IsLcdTextEnabled();
  settings.use_zero_copy = compositor_deps->IsZeroCopyEnabled();
  settings.use_partial_raster = compositor_deps->IsPartialRasterEnabled();
  settings.enable_elastic_overscroll =
      compositor_deps->IsElasticOverscrollEnabled();
  settings.resource_settings.use_gpu_memory_buffer_resources =
      compositor_deps->IsGpuMemoryBufferCompositorResourcesEnabled();
  settings.use_painted_device_scale_factor =
      compositor_deps->IsUseZoomForDSFEnabled();

  // Build LayerTreeSettings from command line args.
  if (cmd.HasSwitch(cc::switches::kBrowserControlsShowThreshold)) {
    std::string top_threshold_str =
        cmd.GetSwitchValueASCII(cc::switches::kBrowserControlsShowThreshold);
    double show_threshold;
    if (base::StringToDouble(top_threshold_str, &show_threshold) &&
        show_threshold >= 0.f && show_threshold <= 1.f)
      settings.top_controls_show_threshold = show_threshold;
  }

  if (cmd.HasSwitch(cc::switches::kBrowserControlsHideThreshold)) {
    std::string top_threshold_str =
        cmd.GetSwitchValueASCII(cc::switches::kBrowserControlsHideThreshold);
    double hide_threshold;
    if (base::StringToDouble(top_threshold_str, &hide_threshold) &&
        hide_threshold >= 0.f && hide_threshold <= 1.f)
      settings.top_controls_hide_threshold = hide_threshold;
  }

  // Blink sends cc a layer list and property trees.
  settings.use_layer_lists = true;

  // Blink currently doesn't support setting fractional scroll offsets so CC
  // must send integer values. We plan to eventually make Blink use fractional
  // offsets internally: https://crbug.com/414283.
  settings.commit_fractional_scroll_deltas =
      blink::WebRuntimeFeatures::IsFractionalScrollOffsetsEnabled();

  settings.enable_smooth_scroll = compositor_deps->IsScrollAnimatorEnabled();

  // The means the renderer compositor has 2 possible modes:
  // - Threaded compositing with a scheduler.
  // - Single threaded compositing without a scheduler (for web tests only).
  // Using the scheduler in web tests introduces additional composite steps
  // that create flakiness.
  settings.single_thread_proxy_scheduler = false;

  // These flags should be mirrored by UI versions in ui/compositor/.
  if (cmd.HasSwitch(cc::switches::kShowCompositedLayerBorders))
    settings.initial_debug_state.show_debug_borders.set();
  settings.initial_debug_state.show_fps_counter =
      cmd.HasSwitch(cc::switches::kShowFPSCounter);
  settings.initial_debug_state.show_layer_animation_bounds_rects =
      cmd.HasSwitch(cc::switches::kShowLayerAnimationBounds);
  settings.initial_debug_state.show_paint_rects =
      cmd.HasSwitch(blink::switches::kShowPaintRects);
  settings.initial_debug_state.show_layout_shift_regions =
      cmd.HasSwitch(blink::switches::kShowLayoutShiftRegions);
  settings.initial_debug_state.show_property_changed_rects =
      cmd.HasSwitch(cc::switches::kShowPropertyChangedRects);
  settings.initial_debug_state.show_surface_damage_rects =
      cmd.HasSwitch(cc::switches::kShowSurfaceDamageRects);
  settings.initial_debug_state.show_screen_space_rects =
      cmd.HasSwitch(cc::switches::kShowScreenSpaceRects);
  settings.initial_debug_state.highlight_non_lcd_text_layers =
      cmd.HasSwitch(cc::switches::kHighlightNonLCDTextLayers);

  settings.initial_debug_state.SetRecordRenderingStats(
      cmd.HasSwitch(cc::switches::kEnableGpuBenchmarking));

  if (cmd.HasSwitch(cc::switches::kSlowDownRasterScaleFactor)) {
    const int kMinSlowDownScaleFactor = 0;
    const int kMaxSlowDownScaleFactor = INT_MAX;
    switch_value_as_int(
        cmd, cc::switches::kSlowDownRasterScaleFactor, kMinSlowDownScaleFactor,
        kMaxSlowDownScaleFactor,
        &settings.initial_debug_state.slow_down_raster_scale_factor);
  }

  // This is default overlay scrollbar settings for Android and DevTools mobile
  // emulator. Aura Overlay Scrollbar will override below.
  settings.scrollbar_animator = cc::LayerTreeSettings::ANDROID_OVERLAY;
  settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
  settings.scrollbar_fade_delay = base::TimeDelta::FromMilliseconds(300);
  settings.scrollbar_fade_duration = base::TimeDelta::FromMilliseconds(300);

  if (cmd.HasSwitch(cc::switches::kCCScrollAnimationDurationForTesting)) {
    const int kMinScrollAnimationDuration = 0;
    const int kMaxScrollAnimationDuration = INT_MAX;
    int duration;
    if (switch_value_as_int(cmd,
                            cc::switches::kCCScrollAnimationDurationForTesting,
                            kMinScrollAnimationDuration,
                            kMaxScrollAnimationDuration, &duration)) {
      settings.scroll_animation_duration_for_testing =
          base::TimeDelta::FromSeconds(duration);
    }
  }

#if defined(OS_ANDROID)
  bool using_synchronous_compositor =
      compositor_deps->UsingSynchronousCompositing();
  bool using_low_memory_policy =
      base::SysInfo::IsLowEndDevice() && !IsSmallScreen(screen_size);

  settings.use_stream_video_draw_quad = true;
  settings.using_synchronous_renderer_compositor = using_synchronous_compositor;
  if (using_synchronous_compositor) {
    // Android WebView uses system scrollbars, so make ours invisible.
    // http://crbug.com/677348: This can't be done using hide_scrollbars
    // setting because supporting -webkit custom scrollbars is still desired
    // on sublayers.
    settings.scrollbar_animator = cc::LayerTreeSettings::NO_ANIMATOR;
    settings.solid_color_scrollbar_color = SK_ColorTRANSPARENT;

    settings.enable_early_damage_check =
        cmd.HasSwitch(cc::switches::kCheckDamageEarly);
  }
  // Android WebView handles root layer flings itself.
  settings.ignore_root_layer_flings = using_synchronous_compositor;
  // Memory policy on Android WebView does not depend on whether device is
  // low end, so always use default policy.
  if (using_low_memory_policy && !using_synchronous_compositor) {
    // On low-end we want to be very carefull about killing other
    // apps. So initially we use 50% more memory to avoid flickering
    // or raster-on-demand.
    settings.max_memory_for_prepaint_percentage = 67;
  } else {
    // On other devices we have increased memory excessively to avoid
    // raster-on-demand already, so now we reserve 50% _only_ to avoid
    // raster-on-demand, and use 50% of the memory otherwise.
    settings.max_memory_for_prepaint_percentage = 50;
  }

  // TODO(danakj): Only do this on low end devices.
  settings.create_low_res_tiling = true;

#else   // defined(OS_ANDROID)
  bool using_synchronous_compositor = false;  // Only for Android WebView.
  // On desktop, we never use the low memory policy unless we are simulating
  // low-end mode via a switch.
  bool using_low_memory_policy =
      cmd.HasSwitch(switches::kEnableLowEndDeviceMode);

  if (ui::IsOverlayScrollbarEnabled()) {
    settings.scrollbar_animator = cc::LayerTreeSettings::AURA_OVERLAY;
    settings.scrollbar_fade_delay = ui::kOverlayScrollbarFadeDelay;
    settings.scrollbar_fade_duration = ui::kOverlayScrollbarFadeDuration;
    settings.scrollbar_thinning_duration =
        ui::kOverlayScrollbarThinningDuration;
    settings.scrollbar_flash_after_any_scroll_update =
        ui::OverlayScrollbarFlashAfterAnyScrollUpdate();
    settings.scrollbar_flash_when_mouse_enter =
        ui::OverlayScrollbarFlashWhenMouseEnter();
  }

  // On desktop, if there's over 4GB of memory on the machine, increase the
  // working set size to 256MB for both gpu and software.
  const int kImageDecodeMemoryThresholdMB = 4 * 1024;
  if (base::SysInfo::AmountOfPhysicalMemoryMB() >=
      kImageDecodeMemoryThresholdMB) {
    settings.decoded_image_working_set_budget_bytes = 256 * 1024 * 1024;
  } else {
    // This is the default, but recorded here as well.
    settings.decoded_image_working_set_budget_bytes = 128 * 1024 * 1024;
  }
#endif  // defined(OS_ANDROID)

  if (using_low_memory_policy) {
    // RGBA_4444 textures are only enabled:
    //  - If the user hasn't explicitly disabled them
    //  - If system ram is <= 512MB (1GB devices are sometimes low-end).
    //  - If we are not running in a WebView, where 4444 isn't supported.
    //  - If we are not using vulkan, since some GPU drivers don't support
    //    using RGBA4444 as color buffer.
    // TODO(penghuang): query supported formats from GPU process.
    if (!cmd.HasSwitch(blink::switches::kDisableRGBA4444Textures) &&
        base::SysInfo::AmountOfPhysicalMemoryMB() <= 512 &&
        !using_synchronous_compositor &&
        !base::FeatureList::IsEnabled(features::kVulkan)) {
      settings.use_rgba_4444 = viz::RGBA_4444;

      // If we are going to unpremultiply and dither these tiles, we need to
      // allocate an additional RGBA_8888 intermediate for each tile
      // rasterization when rastering to RGBA_4444 to allow for dithering.
      // Setting a reasonable sized max tile size allows this intermediate to
      // be consistently reused.
      if (base::FeatureList::IsEnabled(
              kUnpremultiplyAndDitherLowBitDepthTiles)) {
        settings.max_gpu_raster_tile_size = gfx::Size(512, 256);
        settings.unpremultiply_and_dither_low_bit_depth_tiles = true;
      }
    }
  }

  if (cmd.HasSwitch(blink::switches::kEnableLowResTiling))
    settings.create_low_res_tiling = true;
  if (cmd.HasSwitch(blink::switches::kDisableLowResTiling))
    settings.create_low_res_tiling = false;

  if (cmd.HasSwitch(blink::switches::kEnableRGBA4444Textures) &&
      !cmd.HasSwitch(blink::switches::kDisableRGBA4444Textures)) {
    settings.use_rgba_4444 = true;
  }

  settings.max_staging_buffer_usage_in_bytes = 32 * 1024 * 1024;  // 32MB
  // Use 1/4th of staging buffers on low-end devices.
  if (base::SysInfo::IsLowEndDevice())
    settings.max_staging_buffer_usage_in_bytes /= 4;

  cc::ManagedMemoryPolicy defaults = settings.memory_policy;
  settings.memory_policy = GetGpuMemoryPolicy(defaults, initial_screen_size,
                                              initial_device_scale_factor);

  settings.disallow_non_exact_resource_reuse =
      cmd.HasSwitch(switches::kDisallowNonExactResourceReuse);
#if defined(OS_ANDROID)
  // TODO(crbug.com/746931): This feature appears to be causing visual
  // corruption on certain android devices. Will investigate and re-enable.
  settings.disallow_non_exact_resource_reuse = true;
#endif

  settings.enable_impl_latency_recovery =
      features::IsImplLatencyRecoveryEnabled();
  settings.enable_main_latency_recovery =
      features::IsMainLatencyRecoveryEnabled();

  if (cmd.HasSwitch(switches::kRunAllCompositorStagesBeforeDraw)) {
    settings.wait_for_all_pipeline_stages_before_draw = true;
    settings.enable_impl_latency_recovery = false;
    settings.enable_main_latency_recovery = false;
  }

  settings.enable_image_animation_resync =
      !cmd.HasSwitch(blink::switches::kDisableImageAnimationResync);

  settings.send_compositor_frame_ack = false;

  // Renderer can de-jelly, browser UI can not. We do not know whether we are
  // going to apply de-jelly until we draw a frame in the Viz process. Because
  // of this, all changes in the renderer are based on whether de-jelly may be
  // active (viz::DeJellyEnabled) vs whether it is currently active
  // (viz::DeJellyActive).
  settings.allow_de_jelly_effect = viz::DeJellyEnabled();
  // Disable occlusion if de-jelly effect is enabled.
  settings.enable_occlusion &= !settings.allow_de_jelly_effect;

  settings.enable_transform_interop =
      base::FeatureList::IsEnabled(blink::features::kTransformInterop);

  return settings;
}

// static
cc::ManagedMemoryPolicy RenderWidget::GetGpuMemoryPolicy(
    const cc::ManagedMemoryPolicy& default_policy,
    const gfx::Size& initial_screen_size,
    float initial_device_scale_factor) {
  cc::ManagedMemoryPolicy actual = default_policy;
  actual.bytes_limit_when_visible = 0;

  // If the value was overridden on the command line, use the specified value.
  static bool client_hard_limit_bytes_overridden =
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kForceGpuMemAvailableMb);
  if (client_hard_limit_bytes_overridden) {
    if (base::StringToSizeT(
            base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
                switches::kForceGpuMemAvailableMb),
            &actual.bytes_limit_when_visible))
      actual.bytes_limit_when_visible *= 1024 * 1024;
    return actual;
  }

#if defined(OS_ANDROID)
  // We can't query available GPU memory from the system on Android.
  // Physical memory is also mis-reported sometimes (eg. Nexus 10 reports
  // 1262MB when it actually has 2GB, while Razr M has 1GB but only reports
  // 128MB java heap size). First we estimate physical memory using both.
  size_t dalvik_mb = base::SysInfo::DalvikHeapSizeMB();
  size_t physical_mb = base::SysInfo::AmountOfPhysicalMemoryMB();
  size_t physical_memory_mb = 0;
  if (base::SysInfo::IsLowEndDevice()) {
    // TODO(crbug.com/742534): The code below appears to no longer work.
    // |dalvik_mb| no longer follows the expected heuristic pattern, causing us
    // to over-estimate memory on low-end devices. This entire section probably
    // needs to be re-written, but for now we can address the low-end Android
    // issues by ignoring |dalvik_mb|.
    physical_memory_mb = physical_mb;
  } else if (dalvik_mb >= 256) {
    physical_memory_mb = dalvik_mb * 4;
  } else {
    physical_memory_mb = std::max(dalvik_mb * 4, (physical_mb * 4) / 3);
  }

  // Now we take a default of 1/8th of memory on high-memory devices,
  // and gradually scale that back for low-memory devices (to be nicer
  // to other apps so they don't get killed). Examples:
  // Nexus 4/10(2GB)    256MB (normally 128MB)
  // Droid Razr M(1GB)  114MB (normally 57MB)
  // Galaxy Nexus(1GB)  100MB (normally 50MB)
  // Xoom(1GB)          100MB (normally 50MB)
  // Nexus S(low-end)   8MB (normally 8MB)
  // Note that the compositor now uses only some of this memory for
  // pre-painting and uses the rest only for 'emergencies'.
  if (actual.bytes_limit_when_visible == 0) {
    // NOTE: Non-low-end devices use only 50% of these limits,
    // except during 'emergencies' where 100% can be used.
    if (physical_memory_mb >= 1536)
      actual.bytes_limit_when_visible = physical_memory_mb / 8;  // >192MB
    else if (physical_memory_mb >= 1152)
      actual.bytes_limit_when_visible = physical_memory_mb / 8;  // >144MB
    else if (physical_memory_mb >= 768)
      actual.bytes_limit_when_visible = physical_memory_mb / 10;  // >76MB
    else if (physical_memory_mb >= 513)
      actual.bytes_limit_when_visible = physical_memory_mb / 12;  // <64MB
    else
      // Devices with this little RAM have very little headroom so we hardcode
      // the limit rather than relying on the heuristics above.  (They also use
      // 4444 textures so we can use a lower limit.)
      actual.bytes_limit_when_visible = 8;

    actual.bytes_limit_when_visible =
        actual.bytes_limit_when_visible * 1024 * 1024;
    // Clamp the observed value to a specific range on Android.
    actual.bytes_limit_when_visible = std::max(
        actual.bytes_limit_when_visible, static_cast<size_t>(8 * 1024 * 1024));
    actual.bytes_limit_when_visible =
        std::min(actual.bytes_limit_when_visible,
                 static_cast<size_t>(256 * 1024 * 1024));
  }
  actual.priority_cutoff_when_visible =
      gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING;
#else
  // Ignore what the system said and give all clients the same maximum
  // allocation on desktop platforms.
  actual.bytes_limit_when_visible = 512 * 1024 * 1024;
  actual.priority_cutoff_when_visible =
      gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;

  // For large monitors (4k), double the tile memory to avoid frequent out of
  // memory problems. 4k could mean a screen width of anywhere from 3840 to 4096
  // (see https://en.wikipedia.org/wiki/4K_resolution). We use 3500 as a proxy
  // for "large enough".
  static const int kLargeDisplayThreshold = 3500;
  int display_width =
      std::round(initial_screen_size.width() * initial_device_scale_factor);
  if (display_width >= kLargeDisplayThreshold)
    actual.bytes_limit_when_visible *= 2;
#endif
  return actual;
}

void RenderWidget::SetHasPointerRawUpdateEventHandlers(bool has_handlers) {
  input_event_queue_->HasPointerRawUpdateEventHandlers(has_handlers);
}

void RenderWidget::SetNeedsLowLatencyInput(bool needs_low_latency) {
  input_event_queue_->SetNeedsLowLatency(needs_low_latency);
}

void RenderWidget::SetNeedsUnbufferedInputForDebugger(bool unbuffered) {
  input_event_queue_->SetNeedsUnbufferedInputForDebugger(unbuffered);
}

void RenderWidget::SetPageScaleStateAndLimits(float page_scale_factor,
                                              bool is_pinch_gesture_active,
                                              float minimum,
                                              float maximum) {
  layer_tree_host_->SetPageScaleFactorAndLimits(page_scale_factor, minimum,
                                                maximum);

  // Only continue if this is a mainframe, or something's actually changed.
  if (!delegate() ||
      (page_scale_factor == page_scale_factor_from_mainframe_ &&
       is_pinch_gesture_active == is_pinch_gesture_active_from_mainframe_)) {
    return;
  }

  DCHECK(!IsForProvisionalFrame());

  // The page scale is controlled by the WebView for the local main frame of
  // the Page. So this is called from blink for the RenderWidget of that
  // local main frame. We forward the value on to each child RenderWidget (each
  // of which will be via proxy child frame). These will each in turn forward
  // the message to their child RenderWidgets (through their proxy child
  // frames).
  for (auto& observer : render_frame_proxies_) {
    observer.OnPageScaleFactorChanged(page_scale_factor,
                                      is_pinch_gesture_active);
  }
  // Store the value to give to any new RenderFrameProxy that is registered.
  page_scale_factor_from_mainframe_ = page_scale_factor;
  is_pinch_gesture_active_from_mainframe_ = is_pinch_gesture_active;
}

void RenderWidget::RequestDecode(const cc::PaintImage& image,
                                 base::OnceCallback<void(bool)> callback) {
  layer_tree_host_->QueueImageDecode(image, std::move(callback));
}

viz::FrameSinkId RenderWidget::GetFrameSinkId() {
  return viz::FrameSinkId(RenderThread::Get()->GetClientId(), routing_id());
}

void RenderWidget::RequestUnbufferedInputEvents() {
  input_event_queue_->RequestUnbufferedInputEvents();
}

void RenderWidget::SetTouchAction(cc::TouchAction touch_action) {
  widget_input_handler_manager_->ProcessTouchAction(touch_action);
}

void RenderWidget::RegisterRenderFrameProxy(RenderFrameProxy* proxy) {
  render_frame_proxies_.AddObserver(proxy);

  // These properties are propagated down the RenderWidget tree through
  // the RenderFrameProxy (see explanation in OnUpdateVisualProperties()).
  // When a new RenderFrameProxy is added, we propagate them immediately.

  proxy->OnPageScaleFactorChanged(page_scale_factor_from_mainframe_,
                                  is_pinch_gesture_active_from_mainframe_);
  proxy->OnScreenInfoChanged(GetOriginalScreenInfo());
  proxy->OnZoomLevelChanged(zoom_level_);
  proxy->OnVisibleViewportSizeChanged(visible_viewport_size_);
  proxy->OnRootWindowSegmentsChanged(root_widget_window_segments_);
}

void RenderWidget::UnregisterRenderFrameProxy(RenderFrameProxy* proxy) {
  render_frame_proxies_.RemoveObserver(proxy);
}

void RenderWidget::RegisterRenderFrame(RenderFrameImpl* frame) {
  render_frames_.AddObserver(frame);
}

void RenderWidget::UnregisterRenderFrame(RenderFrameImpl* frame) {
  render_frames_.RemoveObserver(frame);
}

void RenderWidget::OnWaitNextFrameForTests(
    int main_frame_thread_observer_routing_id) {
  // Sends an ACK to the browser process during the next compositor frame.
  QueueMessage(std::make_unique<WidgetHostMsg_WaitForNextFrameForTests_ACK>(
      main_frame_thread_observer_routing_id));
}

const ScreenInfo& RenderWidget::GetOriginalScreenInfo() const {
  if (device_emulator_)
    return device_emulator_->original_screen_info();
  return screen_info_;
}

gfx::PointF RenderWidget::ConvertWindowPointToViewport(
    const gfx::PointF& point) {
  blink::WebFloatRect point_in_viewport(point.x(), point.y(), 0, 0);
  ConvertWindowToViewport(&point_in_viewport);
  return gfx::PointF(point_in_viewport.x, point_in_viewport.y);
}

gfx::Point RenderWidget::ConvertWindowPointToViewport(const gfx::Point& point) {
  return gfx::ToRoundedPoint(ConvertWindowPointToViewport(gfx::PointF(point)));
}

bool RenderWidget::RequestPointerLock(
    WebLocalFrame* requester_frame,
    blink::WebWidgetClient::PointerLockCallback callback,
    bool request_unadjusted_movement) {
  return mouse_lock_dispatcher_->LockMouse(webwidget_mouse_lock_target_.get(),
                                           requester_frame, std::move(callback),
                                           request_unadjusted_movement);
}

bool RenderWidget::RequestPointerLockChange(
    blink::WebLocalFrame* requester_frame,
    blink::WebWidgetClient::PointerLockCallback callback,
    bool request_unadjusted_movement) {
  return mouse_lock_dispatcher_->ChangeMouseLock(
      webwidget_mouse_lock_target_.get(), requester_frame, std::move(callback),
      request_unadjusted_movement);
}

void RenderWidget::RequestPointerUnlock() {
  mouse_lock_dispatcher_->UnlockMouse(webwidget_mouse_lock_target_.get());
}

bool RenderWidget::IsPointerLocked() {
  return mouse_lock_dispatcher_->IsMouseLockedTo(
      webwidget_mouse_lock_target_.get());
}

void RenderWidget::StartDragging(network::mojom::ReferrerPolicy policy,
                                 const WebDragData& data,
                                 WebDragOperationsMask mask,
                                 const SkBitmap& drag_image,
                                 const gfx::Point& web_image_offset) {
  blink::WebRect offset_in_window(web_image_offset.x(), web_image_offset.y(), 0,
                                  0);
  ConvertViewportToWindow(&offset_in_window);
  DropData drop_data(DropDataBuilder::Build(data));
  drop_data.referrer_policy = policy;
  gfx::Vector2d image_offset(offset_in_window.x, offset_in_window.y);
  Send(new DragHostMsg_StartDragging(routing_id(), drop_data, mask, drag_image,
                                     image_offset, possible_drag_event_info_));
}

void RenderWidget::DidNavigate(ukm::SourceId source_id, const GURL& url) {
  // The input handler wants to know about navigation so that it can
  // suppress input until the newly navigated page has a committed frame.
  // It also resets the state for UMA reporting of input arrival with respect
  // to document lifecycle.
  DCHECK(widget_input_handler_manager_);
  widget_input_handler_manager_->DidNavigate();

  // Update the URL and the document source id used to key UKM metrics in the
  // compositor. Note that the metrics for all frames are keyed to the main
  // frame's URL.
  layer_tree_host_->SetSourceURL(source_id, url);
}

blink::WebInputMethodController* RenderWidget::GetInputMethodController()
    const {
  if (auto* frame_widget = GetFrameWidget())
    return frame_widget->GetActiveWebInputMethodController();

  return nullptr;
}

blink::mojom::WidgetInputHandlerHost* RenderWidget::GetInputHandlerHost() {
  return widget_input_handler_manager_->GetWidgetInputHandlerHost();
}

void RenderWidget::SetMouseCapture(bool capture) {
  if (blink::mojom::WidgetInputHandlerHost* host =
          widget_input_handler_manager_->GetWidgetInputHandlerHost()) {
    host->SetMouseCapture(capture);
  }
}

void RenderWidget::UseSynchronousResizeModeForTesting(bool enable) {
  synchronous_resize_mode_for_testing_ = enable;
}

blink::WebHitTestResult RenderWidget::GetHitTestResultAtPoint(
    const gfx::PointF& point) {
  gfx::PointF point_in_pixel(point);
  if (compositor_deps()->IsUseZoomForDSFEnabled()) {
    point_in_pixel = gfx::ConvertPointToPixel(
        GetOriginalScreenInfo().device_scale_factor, point_in_pixel);
  }
  return GetWebWidget()->HitTestResultAt(point_in_pixel);
}

void RenderWidget::SetDeviceScaleFactorForTesting(float factor) {
  DCHECK_GE(factor, 0.f);

  // Receiving a 0 is used to reset between tests, it removes the override in
  // order to listen to the browser for the next test.
  if (!factor) {
    device_scale_factor_for_testing_ = 0;
    return;
  }

  // We are changing the device scale factor from the renderer, so allocate a
  // new viz::LocalSurfaceId to avoid surface invariants violations in tests.
  layer_tree_host_->RequestNewLocalSurfaceId();

  ScreenInfo info = screen_info_;
  info.device_scale_factor = factor;
  gfx::Size viewport_pixel_size = gfx::ScaleToCeiledSize(size_, factor);
  UpdateSurfaceAndScreenInfo(local_surface_id_allocation_from_parent_,
                             gfx::Rect(viewport_pixel_size), info);
  if (!auto_resize_mode_)
    ResizeWebWidget();  // This picks up the new device scale factor in |info|.

  RenderFrameImpl* render_frame =
      RenderFrameImpl::FromWebFrame(GetFrameWidget()->LocalRoot());
  render_frame->SetPreferCompositingToLCDTextEnabledOnRenderView(
      ComputePreferCompositingToLCDText(compositor_deps_,
                                        screen_info_.device_scale_factor));

  // Make sure to override any future OnSynchronizeVisualProperties IPCs.
  device_scale_factor_for_testing_ = factor;
}

void RenderWidget::SetZoomLevelForTesting(double zoom_level) {
  DCHECK_NE(zoom_level, -INFINITY);
  SetZoomLevel(zoom_level);

  // Make sure to override any future OnSynchronizeVisualProperties IPCs.
  zoom_level_for_testing_ = zoom_level;
}

void RenderWidget::ResetZoomLevelForTesting() {
  zoom_level_for_testing_ = -INFINITY;
  SetZoomLevel(0);
}

void RenderWidget::SetDeviceColorSpaceForTesting(
    const gfx::ColorSpace& color_space) {
  // We are changing the device color space from the renderer, so allocate a
  // new viz::LocalSurfaceId to avoid surface invariants violations in tests.
  layer_tree_host_->RequestNewLocalSurfaceId();

  ScreenInfo info = screen_info_;
  info.color_space = color_space;
  UpdateSurfaceAndScreenInfo(local_surface_id_allocation_from_parent_,
                             CompositorViewportRect(), info);
}

void RenderWidget::SetWindowRectSynchronouslyForTesting(
    const gfx::Rect& new_window_rect) {
  SetWindowRectSynchronously(new_window_rect);
}

void RenderWidget::EnableAutoResizeForTesting(const gfx::Size& min_size,
                                              const gfx::Size& max_size) {
  SetAutoResizeMode(true, min_size, max_size, screen_info_.device_scale_factor);
}

void RenderWidget::DisableAutoResizeForTesting(const gfx::Size& new_size) {
  if (!auto_resize_mode_)
    return;

  SetAutoResizeMode(false, gfx::Size(), gfx::Size(),
                    screen_info_.device_scale_factor);

  // The |new_size| is empty when resetting auto resize in between tests. In
  // this case the current size should just be preserved.
  if (!new_size.IsEmpty()) {
    size_ = new_size;
    ResizeWebWidget();
  }
}

blink::WebLocalFrame* RenderWidget::GetFocusedWebLocalFrameInWidget() const {
  if (auto* frame_widget = GetFrameWidget())
    return frame_widget->FocusedWebLocalFrameInWidget();
  return nullptr;
}

#if BUILDFLAG(ENABLE_PLUGINS)
PepperPluginInstanceImpl* RenderWidget::GetFocusedPepperPluginInsideWidget() {
  blink::WebFrameWidget* frame_widget = GetFrameWidget();
  if (!frame_widget)
    return nullptr;

  // Focused pepper instance might not always be in the focused frame. For
  // instance if a pepper instance and its embedder frame are focused an then
  // another frame takes focus using javascript, the embedder frame will no
  // longer be focused while the pepper instance is (the embedder frame's
  // |focused_pepper_plugin_| is not nullptr). Especially, if the pepper plugin
  // is fullscreen, clicking into the pepper will not refocus the embedder
  // frame. This is why we have to traverse the whole frame tree to find the
  // focused plugin.
  blink::WebFrame* current_frame = frame_widget->LocalRoot();
  while (current_frame) {
    RenderFrameImpl* render_frame =
        current_frame->IsWebLocalFrame()
            ? RenderFrameImpl::FromWebFrame(current_frame)
            : nullptr;
    if (render_frame && render_frame->focused_pepper_plugin())
      return render_frame->focused_pepper_plugin();
    current_frame = current_frame->TraverseNext();
  }
  return nullptr;
}
#endif

gfx::Rect RenderWidget::ViewportVisibleRect() {
  if (for_child_local_root_frame_)
    return compositor_visible_rect_;
  return CompositorViewportRect();
}

base::WeakPtr<RenderWidget> RenderWidget::AsWeakPtr() {
  return weak_ptr_factory_.GetWeakPtr();
}

}  // namespace content