1 files changed, 61 insertions, 0 deletions
diff --git a/chromium/content/child/webthemeengine_impl_mac.cc b/chromium/content/child/webthemeengine_impl_mac.cc
index dbd8f0bda68..f8aa72dbe3c 100644
--- a/chromium/content/child/webthemeengine_impl_mac.cc
+++ b/chromium/content/child/webthemeengine_impl_mac.cc
@@ -18,4 +18,65 @@ void WebThemeEngineMac::SetForcedColors(
   forced_colors_ = forced_colors;
 }
 
+void WebThemeEngineMac::Paint(cc::PaintCanvas* canvas,
+                              WebThemeEngine::Part part,
+                              WebThemeEngine::State state,
+                              const blink::WebRect& rect,
+                              const WebThemeEngine::ExtraParams* extra_params,
+                              blink::WebColorScheme color_scheme) {
+  if (IsScrollbarPart(part)) {
+    PaintMacScrollBarParts(canvas, part, state, rect, extra_params,
+                           color_scheme);
+    return;
+  }
+
+  WebThemeEngineDefault::Paint(canvas, part, state, rect, extra_params,
+                               color_scheme);
+}
+
+bool WebThemeEngineMac::IsScrollbarPart(WebThemeEngine::Part part) {
+  switch (part) {
+    case WebThemeEngine::kPartScrollbarHorizontalTrack:
+    case WebThemeEngine::kPartScrollbarVerticalTrack:
+    case WebThemeEngine::kPartScrollbarHorizontalThumb:
+    case WebThemeEngine::kPartScrollbarVerticalThumb:
+    case WebThemeEngine::kPartScrollbarCorner:
+      return true;
+    default:
+      return false;
+  }
+}
+
+void WebThemeEngineMac::PaintMacScrollBarParts(
+    cc::PaintCanvas* canvas,
+    WebThemeEngine::Part part,
+    WebThemeEngine::State state,
+    const blink::WebRect& rect,
+    const WebThemeEngine::ExtraParams* extra_params,
+    blink::WebColorScheme color_scheme) {
+  ui::NativeTheme::ExtraParams native_theme_extra_params;
+  native_theme_extra_params.scrollbar_extra.is_hovering =
+      extra_params->scrollbar_extra.is_hovering;
+  native_theme_extra_params.scrollbar_extra.is_overlay =
+      extra_params->scrollbar_extra.is_overlay;
+  switch (extra_params->scrollbar_extra.orientation) {
+    case WebThemeEngine::kVerticalOnRight:
+      native_theme_extra_params.scrollbar_extra.orientation =
+          ui::NativeTheme::ScrollbarOrientation::kVerticalOnRight;
+      break;
+    case WebThemeEngine::kVerticalOnLeft:
+      native_theme_extra_params.scrollbar_extra.orientation =
+          ui::NativeTheme::ScrollbarOrientation::kVerticalOnLeft;
+      break;
+    case WebThemeEngine::kHorizontal:
+      native_theme_extra_params.scrollbar_extra.orientation =
+          ui::NativeTheme::ScrollbarOrientation::kHorizontal;
+      break;
+  }
+
+  ui::NativeTheme::GetInstanceForNativeUi()->Paint(
+      canvas, NativeThemePart(part), NativeThemeState(state), gfx::Rect(rect),
+      native_theme_extra_params, NativeColorScheme(color_scheme));
+}
+
 }  // namespace content