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

chrome/browser/gpu_process_host.h

 // Copyright (c) 2010 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_GPU_PROCESS_HOST_H_
 #define CHROME_BROWSER_GPU_PROCESS_HOST_H_
 #pragma once
 
 #include <queue>
 
@@ skipping 84 matching lines @@
                             const GPUInfo& gpu_info);
   void OnSynchronizeReply();
   void OnGraphicsInfoCollected(const GPUInfo& gpu_info);
 #if defined(OS_LINUX)
   void OnGetViewXID(gfx::NativeViewId id, IPC::Message* reply_msg);
 #elif defined(OS_MACOSX)
   void OnAcceleratedSurfaceSetIOSurface(
       const GpuHostMsg_AcceleratedSurfaceSetIOSurface_Params& params);
   void OnAcceleratedSurfaceBuffersSwapped(int32 renderer_id,
                                           int32 render_view_id,
-                                          gfx::PluginWindowHandle window);
+                                          gfx::PluginWindowHandle window,
+                                          uint64 surface_id);
 #endif
 
   void ReplyToRenderer(const IPC::ChannelHandle& channel,
                        const GPUInfo& gpu_info,
                        ResourceMessageFilter* filter);
 
   // ResourceDispatcherHost::Receiver implementation:
   virtual URLRequestContext* GetRequestContext(
       uint32 request_id,
       const ViewHostMsg_Resource_Request& request_data);
@@ skipping 10 matching lines @@
   // the GPU process, but haven't heard back about yet.
   std::queue<ChannelRequest> sent_requests_;
 
   // The pending synchronization requests we need to reply to.
   std::queue<SynchronizationRequest> queued_synchronization_replies_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };
 
 #endif  // CHROME_BROWSER_GPU_PROCESS_HOST_H_