Mac: Don't hang gpu process on popup close under certain conditions

chrome/gpu/gpu_thread.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_GPU_GPU_THREAD_H_
 #define CHROME_GPU_GPU_THREAD_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
@@ skipping 25 matching lines @@
   virtual void OnControlMessageReceived(const IPC::Message& msg);
 
   // Message handlers.
   void OnEstablishChannel(int renderer_id);
   void OnCloseChannel(const IPC::ChannelHandle& channel_handle);
   void OnSynchronize();
   void OnCollectGraphicsInfo();
 #if defined(OS_MACOSX)
   void OnAcceleratedSurfaceBuffersSwappedACK(
       int renderer_id, int32 route_id, uint64 swap_buffers_count);
+  void OnDidDestroySurface(int renderer_id, int32 renderer_route_id);
 #endif
   void OnCrash();
   void OnHang();
 
 #if defined(OS_WIN)
   static void CollectDxDiagnostics(GpuThread* thread);
   static void SetDxDiagnostics(GpuThread* thread, const DxDiagNode& node);
 #endif
 
   typedef base::hash_map<int, scoped_refptr<GpuChannel> > GpuChannelMap;
   GpuChannelMap gpu_channels_;
 
   // Information about the GPU, such as device and vendor ID.
   GPUInfo gpu_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuThread);
 };
 
 #endif  // CHROME_GPU_GPU_THREAD_H_