Send vsync notification from browser to renderer

content/renderer/gpu/compositor_output_surface.h

Index: content/renderer/gpu/compositor_output_surface.h
diff --git a/content/renderer/gpu/compositor_output_surface.h b/content/renderer/gpu/compositor_output_surface.h
index 999521df667b80f13c0c7ef31bed8bc8d997282e..8c0f7467d2f5582de4651b1907ac05f15121a9e3 100644
--- a/content/renderer/gpu/compositor_output_surface.h
+++ b/content/renderer/gpu/compositor_output_surface.h
@@ -51,6 +51,7 @@ class CompositorOutputSurface
   virtual void SendFrameToParentCompositor(cc::CompositorFrame*) OVERRIDE;
   virtual void PostSubBuffer(gfx::Rect rect, const cc::LatencyInfo&) OVERRIDE;
   virtual void SwapBuffers(const cc::LatencyInfo&) OVERRIDE;
+  virtual void EnableVSyncNotification(bool enable) OVERRIDE;
 
   // TODO(epenner): This seems out of place here and would be a better fit
   // int CompositorThread after it is fully refactored (http://crbug/170828)
@@ -83,6 +84,7 @@ class CompositorOutputSurface
   void OnMessageReceived(const IPC::Message& message);
   void OnUpdateVSyncParameters(
       base::TimeTicks timebase, base::TimeDelta interval);
+  void DidVSync(base::TimeTicks frame_time);
   bool Send(IPC::Message* message);
 
   scoped_refptr<IPC::ForwardingMessageFilter> output_surface_filter_;