Implement GpuArcVideoService for arc video accelerator

content/common/gpu/gpu_channel.h

Index: content/common/gpu/gpu_channel.h
diff --git a/content/common/gpu/gpu_channel.h b/content/common/gpu/gpu_channel.h
index a47ccf941c28c18e010d88eb659ccac1ad5134e4..1af6e7469492aa305bafe569228a60d102724dab 100644
--- a/content/common/gpu/gpu_channel.h
+++ b/content/common/gpu/gpu_channel.h
@@ -50,6 +50,7 @@ class MessageFilter;
 }
 
 namespace content {
+class GpuArcAccelerator;
 class GpuChannelManager;
 class GpuChannelMessageFilter;
 class GpuChannelMessageQueue;
@@ -228,6 +229,8 @@ class CONTENT_EXPORT GpuChannel
       bool* succeeded);
   void OnDestroyCommandBuffer(int32 route_id);
   void OnCreateJpegDecoder(int32 route_id, IPC::Message* reply_msg);
+  void OnCreateArcAccelerator(uint32_t device_type);
+  void OnShutdownArcAccelerators();
 
   // The lifetime of objects of this class is managed by a GpuChannelManager.
   // The GpuChannelManager destroy all the GpuChannels that they own when they
@@ -278,6 +281,8 @@ class CONTENT_EXPORT GpuChannel
 
   scoped_ptr<GpuJpegDecodeAccelerator> jpeg_decoder_;
 
+  scoped_ptr<GpuArcAccelerator> arc_accelerator_;
+
   gpu::gles2::DisallowedFeatures disallowed_features_;
   GpuWatchdog* watchdog_;