Implement GpuArcVideoService for arc video accelerator

content/common/gpu/gpu_channel_manager.h

Index: content/common/gpu/gpu_channel_manager.h
diff --git a/content/common/gpu/gpu_channel_manager.h b/content/common/gpu/gpu_channel_manager.h
index c3e889a27e2cc78ba23699342e6c3967c8653367..b1757378e3536b5a4c971e7b7004c3feb2ab187f 100644
--- a/content/common/gpu/gpu_channel_manager.h
+++ b/content/common/gpu/gpu_channel_manager.h
@@ -55,6 +55,7 @@ struct GPUCreateCommandBufferConfig;
 struct GpuMsg_EstablishChannel_Params;
 
 namespace content {
+class GpuArcVideoService;
 class GpuChannel;
 class GpuMemoryBufferFactory;
 class GpuWatchdog;
@@ -159,6 +160,8 @@ class CONTENT_EXPORT GpuChannelManager : public IPC::Listener,
   void OnDestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                 int client_id,
                                 const gpu::SyncToken& sync_token);
+  void OnCreateArcVideoAcceleratorChannel();
+  void OnShutdownArcVideoService();
 
   void OnUpdateValueState(int client_id,
                           unsigned int target,
@@ -190,6 +193,7 @@ class CONTENT_EXPORT GpuChannelManager : public IPC::Listener,
   scoped_refptr<gpu::gles2::FramebufferCompletenessCache>
       framebuffer_completeness_cache_;
   scoped_refptr<gfx::GLSurface> default_offscreen_surface_;
+  scoped_ptr<GpuArcVideoService> arc_video_service_;
   GpuMemoryBufferFactory* const gpu_memory_buffer_factory_;
 #if defined(OS_ANDROID)
   // Last time we know the GPU was powered on. Global for tracking across all