Let every "accelerated IO surface swapped" message have an identifier of the surface.

chrome/browser/renderer_host/render_widget_host.h

 // Copyright (c) 2009 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 493 matching lines @@
                                         gfx::PluginWindowHandle* id);
   void OnDestroyFakePluginWindowHandle(gfx::PluginWindowHandle id);
   void OnAcceleratedSurfaceSetIOSurface(gfx::PluginWindowHandle window,
                                         int32 width,
                                         int32 height,
                                         uint64 mach_port);
   void OnAcceleratedSurfaceSetTransportDIB(gfx::PluginWindowHandle window,
                                            int32 width,
                                            int32 height,
                                            TransportDIB::Handle transport_dib);
-  void OnAcceleratedSurfaceBuffersSwapped(gfx::PluginWindowHandle window);
+  void OnAcceleratedSurfaceBuffersSwapped(gfx::PluginWindowHandle window,
+                                          uint64 surface_id);
 #elif defined(OS_POSIX)
   void OnMsgCreatePluginContainer(gfx::PluginWindowHandle id);
   void OnMsgDestroyPluginContainer(gfx::PluginWindowHandle id);
 #endif
 
   // Paints the given bitmap to the current backing store at the given location.
   // |*painted_synchronously| will be true if the message was processed
   // synchronously, and the bitmap is done being used. False means that the
   // backing store will paint the bitmap at a later time and that the DIB can't
   // be freed (it will be the backing store's job to free it later).
@@ skipping 164 matching lines @@
   // changed.
   bool suppress_next_char_events_;
 
   // Optional video YUV layer for used for out-of-process compositing.
   scoped_ptr<VideoLayer> video_layer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_