Implement proper synchronization between HW video decode IPC and CommandBuffer.

content/renderer/gpu/gpu_video_service_host.cc

 // 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.
 
 #include "content/renderer/gpu/gpu_video_service_host.h"
 
 #include "content/common/gpu/gpu_messages.h"
 #include "content/renderer/gpu/gpu_video_decode_accelerator_host.h"
 #include "content/renderer/render_thread.h"
 #include "media/video/video_decode_accelerator.h"
@@ skipping 54 matching lines @@
     DCHECK(on_initialized_.is_null());
     on_initialized_ = on_initialized;
     channel = channel_;
   }
   if (channel)
     on_initialized.Run();
 }
 
 GpuVideoDecodeAcceleratorHost* GpuVideoServiceHost::CreateVideoAccelerator(
     media::VideoDecodeAccelerator::Client* client,
-    int command_buffer_route_id) {
+    int32 command_buffer_route_id,
+    gpu::CommandBufferHelper* cmd_buffer_helper) {
   base::AutoLock auto_lock(lock_);
   DCHECK(channel_);
   return new GpuVideoDecodeAcceleratorHost(
       &router_, channel_, next_decoder_host_id_++,
-      command_buffer_route_id, client);
+      command_buffer_route_id, cmd_buffer_helper, client);
 }