Deliver IPC messages together with SwapCompositorFrame

content/public/browser/web_contents_observer.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
@@ skipping 222 matching lines @@
                                    WindowOpenDisposition disposition,
                                    PageTransition transition,
                                    int64 source_frame_id) {}
 
   virtual void FrameDetached(RenderViewHost* render_view_host,
                              int64 frame_id) {}
 
   // This method is invoked when the renderer has completed its first paint
   // after a non-empty layout.
   virtual void DidFirstVisuallyNonEmptyPaint(int32 page_id) {}
+  virtual void OnSourceFrameNumber(int source_frame_number, int tag) {}
 
   // These two methods correspond to the points in time when the spinner of the
   // tab starts and stops spinning.
   virtual void DidStartLoading(RenderViewHost* render_view_host) {}
   virtual void DidStopLoading(RenderViewHost* render_view_host) {}
 
   // When WebContents::Stop() is called, the WebContents stops loading and then
   // invokes this method. If there are ongoing navigations, their respective
   // failure methods will also be invoked.
   virtual void NavigationStopped() {}
@@ skipping 72 matching lines @@
   // Invoked when the beforeunload handler fires. The time is from the renderer.
   virtual void BeforeUnloadFired(const base::TimeTicks& proceed_time) {}
 
   // Invoked when a user cancels a before unload dialog.
   virtual void BeforeUnloadDialogCancelled() {}
 
   // Invoked when an accessibility event is received from the renderer.
   virtual void AccessibilityEventReceived(
       const std::vector<AXEventNotificationDetails>& details) {}
 
+  virtual bool DispatchMessageWithSwapFrame(const IPC::Message& message) {}

[mkosiba (inactive), 2014/05/06 22:30:33]

this is where subclasses from different layers (think chrome/ vs
android_webview/) would hook in.

+
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Sender implementation.
   virtual bool Send(IPC::Message* message) OVERRIDE;
   int routing_id() const;
 
  protected:
   // Use this constructor when the object is tied to a single WebContents for
   // its entire lifetime.
@@ skipping 19 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_