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diff --git a/chromium/content/browser/browser_plugin/browser_plugin_guest_manager.h b/chromium/content/browser/browser_plugin/browser_plugin_guest_manager.h
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+++ b/chromium/content/browser/browser_plugin/browser_plugin_guest_manager.h
@@ -0,0 +1,137 @@
+// Copyright 2013 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.
+
+// A BrowserPluginGuestManager serves as a message router to BrowserPluginGuests
+// for all guests within a given profile.
+// Messages are routed to a particular guest instance based on an instance_id.
+
+#ifndef CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_MANAGER_H_
+#define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_MANAGER_H_
+
+#include "base/basictypes.h"
+#include "base/supports_user_data.h"
+#include "base/values.h"
+#include "content/common/content_export.h"
+#include "ipc/ipc_message.h"
+
+struct BrowserPluginHostMsg_Attach_Params;
+struct BrowserPluginHostMsg_ResizeGuest_Params;
+class GURL;
+
+namespace gfx {
+class Point;
+}
+
+namespace IPC {
+class Message;
+}  // namespace IPC
+
+namespace content {
+
+class BrowserPluginGuest;
+class BrowserPluginHostFactory;
+class RenderProcessHostImpl;
+class RenderWidgetHostImpl;
+class SiteInstance;
+class WebContents;
+class WebContentsImpl;
+struct NativeWebKeyboardEvent;
+
+class CONTENT_EXPORT BrowserPluginGuestManager :
+    public base::SupportsUserData::Data {
+ public:
+  virtual ~BrowserPluginGuestManager();
+
+  static BrowserPluginGuestManager* Create();
+
+  // Overrides factory for testing. Default (NULL) value indicates regular
+  // (non-test) environment.
+  static void set_factory_for_testing(BrowserPluginHostFactory* factory) {
+    content::BrowserPluginGuestManager::factory_ = factory;
+  }
+
+  // Gets the next available instance id.
+  int get_next_instance_id() { return ++next_instance_id_; }
+
+  // Creates a guest WebContents with the provided |instance_id| and |params|.
+  // If params.src is present, the new guest will also be navigated to the
+  // provided URL. Optionally, the new guest may be attached to a
+  // |guest_opener|, and may be attached to a pre-selected |routing_id|.
+  BrowserPluginGuest* CreateGuest(
+      SiteInstance* embedder_site_instance,
+      int instance_id,
+      const BrowserPluginHostMsg_Attach_Params& params,
+      scoped_ptr<base::DictionaryValue> extra_params);
+
+  // Returns a BrowserPluginGuest given an |instance_id|. Returns NULL if the
+  // guest wasn't found.  If the embedder is not permitted to access the given
+  // |instance_id|, the embedder is killed, and NULL is returned.
+  BrowserPluginGuest* GetGuestByInstanceID(
+      int instance_id,
+      int embedder_render_process_id) const;
+
+  // Adds a new |guest_web_contents| to the embedder (overridable in test).
+  virtual void AddGuest(int instance_id, WebContentsImpl* guest_web_contents);
+
+  // Removes the guest with the given |instance_id| from this
+  // BrowserPluginGuestManager.
+  void RemoveGuest(int instance_id);
+
+  // Returns whether the specified embedder is permitted to access the given
+  // |instance_id|, and kills the embedder if not.
+  bool CanEmbedderAccessInstanceIDMaybeKill(int embedder_render_process_id,
+                                            int instance_id) const;
+
+  void DidSendScreenRects(WebContentsImpl* embedder_web_contents);
+
+  bool UnlockMouseIfNecessary(WebContentsImpl* embedder_web_contents_,
+                              const NativeWebKeyboardEvent& event);
+
+  void OnMessageReceived(const IPC::Message& message, int render_process_id);
+
+ private:
+  friend class TestBrowserPluginGuestManager;
+
+  BrowserPluginGuestManager();
+
+  // Returns whether the given embedder process is allowed to access the
+  // provided |guest|.
+  static bool CanEmbedderAccessGuest(int embedder_render_process_id,
+                                     BrowserPluginGuest* guest);
+
+  // Returns whether the given embedder process is allowed to use the provided
+  // |instance_id| or access the guest associated with the |instance_id|. If the
+  // embedder can, the method returns true. If the guest does not exist but the
+  // embedder can use that |instance_id|, then it returns true. If the embedder
+  // is not permitted to use that instance ID or access the associated guest,
+  // then it returns false.
+  bool CanEmbedderAccessInstanceID(int embedder_render_process_id,
+                                   int instance_id) const;
+
+  // Returns an existing SiteInstance if the current profile has a guest of the
+  // given |guest_site|.
+  SiteInstance* GetGuestSiteInstance(const GURL& guest_site);
+
+  // Message handlers.
+  void OnUnhandledSwapBuffersACK(int instance_id,
+                                 int route_id,
+                                 int gpu_host_id,
+                                 const std::string& mailbox_name,
+                                 uint32 sync_point);
+
+  // Static factory instance (always NULL outside of tests).
+  static BrowserPluginHostFactory* factory_;
+
+  // Contains guests' WebContents, mapping from their instance ids.
+  typedef std::map<int, WebContentsImpl*> GuestInstanceMap;
+  GuestInstanceMap guest_web_contents_by_instance_id_;
+  int next_instance_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuestManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_MANAGER_H_
+