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

chrome/browser/renderer_host/render_widget_host.h

Index: chrome/browser/renderer_host/render_widget_host.h
diff --git a/chrome/browser/renderer_host/render_widget_host.h b/chrome/browser/renderer_host/render_widget_host.h
index a914a4073fdac87d852ea06a220e3b2f97bbf255..fe8ad8542f5fd26679ec85df09d7caacc0441291 100644
--- a/chrome/browser/renderer_host/render_widget_host.h
+++ b/chrome/browser/renderer_host/render_widget_host.h
@@ -511,7 +511,8 @@ class RenderWidgetHost : public IPC::Channel::Listener,
                                            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);