Use inner HWND for accelerated rendering on windows

chrome/gpu/gpu_command_buffer_stub.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_COMMAND_BUFFER_STUB_H_
 #define CHROME_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
@@ skipping 33 matching lines @@
   virtual void OnMessageReceived(const IPC::Message& message);
 
   // IPC::Message::Sender implementation:
   virtual bool Send(IPC::Message* msg);
 
   // Get the GLContext associated with this object.
   gpu::GPUProcessor* processor() const { return processor_.get(); }
 
   int32 route_id() const { return route_id_; }
 
+#if defined(OS_WIN)
+  void OnCompositorWindowPainted();
+#endif
+
  private:
   // Message handlers:
   void OnInitialize(int32 size, base::SharedMemoryHandle* ring_buffer);
   void OnGetState(gpu::CommandBuffer::State* state);
   void OnAsyncGetState();
   void OnFlush(int32 put_offset, gpu::CommandBuffer::State* state);
   void OnAsyncFlush(int32 put_offset);
   void OnCreateTransferBuffer(int32 size, int32* id);
   void OnDestroyTransferBuffer(int32 id);
   void OnGetTransferBuffer(int32 id,
                            base::SharedMemoryHandle* transfer_buffer,
                            uint32* size);
   void OnResizeOffscreenFrameBuffer(const gfx::Size& size);
 
   void OnSwapBuffers();
 
 #if defined(OS_MACOSX)
   void OnSetWindowSize(const gfx::Size& size);
   void SwapBuffersCallback();
+#elif defined(OS_WIN)
+  void CreateCompositorWindow();
+  HWND compositor_window_;
 #endif
 
   // The lifetime of objects of this class is managed by a GpuChannel. The
   // GpuChannels destroy all the GpuCommandBufferStubs that they own when they
   // are destroyed. So a raw pointer is safe.
   GpuChannel* channel_;
 
   gfx::PluginWindowHandle handle_;
   base::WeakPtr<GpuCommandBufferStub> parent_;
   gfx::Size initial_size_;
   std::string allowed_extensions_;
   std::vector<int32> requested_attribs_;
   uint32 parent_texture_id_;
   int32 route_id_;
 
   // The following two fields are used on Mac OS X to identify the window
   // for the rendering results on the browser side.
   int32 renderer_id_;
   int32 render_view_id_;
 
   scoped_ptr<gpu::CommandBufferService> command_buffer_;
   scoped_ptr<gpu::GPUProcessor> processor_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 #endif  // ENABLE_GPU
 
 #endif  // CHROME_GPU_GPU_COMMAND_BUFFER_STUB_H_