Enable fire-and-forget Destroy of HW video decoder, and misc other improvements.

content/common/gpu/media/gpu_video_decode_accelerator.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_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 29 matching lines @@
       const gfx::Size& dimensions,
       media::VideoDecodeAccelerator::MemoryType type) OVERRIDE;
   virtual void DismissPictureBuffer(int32 picture_buffer_id) OVERRIDE;
   virtual void PictureReady(const media::Picture& picture) OVERRIDE;
   virtual void NotifyInitializeDone() OVERRIDE;
   virtual void NotifyEndOfStream() OVERRIDE;
   virtual void NotifyError(media::VideoDecodeAccelerator::Error error) OVERRIDE;
   virtual void NotifyEndOfBitstreamBuffer(int32 bitstream_buffer_id) OVERRIDE;
   virtual void NotifyFlushDone() OVERRIDE;
   virtual void NotifyResetDone() OVERRIDE;
-  virtual void NotifyDestroyDone() OVERRIDE;
 
   // Function to delegate sending to actual sender.
   virtual bool Send(IPC::Message* message);
 
   // Callback to be fired when the underlying stub receives a new token.
   void OnSetToken(int32 token);
 
   // Initialize the accelerator with the given configuration.
   void Initialize(const std::vector<uint32>& configs);
 
@@ skipping 25 matching lines @@
   // Route ID to communicate with the host.
   int32 host_route_id_;
 
   // Messages deferred for later processing when their tokens have come to pass.
   std::vector<IPC::Message*> deferred_messages_;
 
   // Unowned pointer to the underlying GpuCommandBufferStub.
   GpuCommandBufferStub* stub_;
 
   // Pointer to the underlying VideoDecodeAccelerator.
-  scoped_ptr<media::VideoDecodeAccelerator> video_decode_accelerator_;
+  scoped_refptr<media::VideoDecodeAccelerator> video_decode_accelerator_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(GpuVideoDecodeAccelerator);
 };
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_