Allow cmdbuffer creation from compositor thread.

content/renderer/gpu/command_buffer_proxy.h

 // Copyright (c) 2011 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 CONTENT_RENDERER_GPU_COMMAND_BUFFER_PROXY_H_
 #define CONTENT_RENDERER_GPU_COMMAND_BUFFER_PROXY_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
 #include <map>
 #include <queue>
 
 #include "base/callback_old.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "content/renderer/gpu/gpu_video_decode_accelerator_host.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_message.h"
 
 namespace base {
 class SharedMemory;
 }
 
 namespace gfx {
 class Size;
 }
 
 class GpuChannelHost;
 class PluginChannelHost;
 class Task;
 
 // Client side proxy that forwards messages synchronously to a
 // CommandBufferStub.
 class CommandBufferProxy : public gpu::CommandBuffer,
-                           public IPC::Channel::Listener {
+                           public IPC::Channel::Listener,
+                           public base::SupportsWeakPtr<CommandBufferProxy> {
  public:
   CommandBufferProxy(GpuChannelHost* channel, int route_id);
   virtual ~CommandBufferProxy();
 
   // IPC::Channel::Listener implementation:
   virtual bool OnMessageReceived(const IPC::Message& message);
   virtual void OnChannelError();
 
   int route_id() const { return route_id_; }
 
@@ skipping 81 matching lines @@
 
   scoped_ptr<Callback0::Type> swap_buffers_callback_;
   scoped_ptr<Callback0::Type> channel_error_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxy);
 };
 
 #endif  // ENABLE_GPU
 
 #endif  // CONTENT_RENDERER_GPU_COMMAND_BUFFER_PROXY_H_