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

content/renderer/gpu/gpu_video_decode_accelerator_host.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_RENDERER_GPU_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
 #define CONTENT_RENDERER_GPU_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 49 matching lines @@
   void OnProvidePictureBuffer(
     uint32 num_requested_buffers, const gfx::Size& buffer_size, int32 mem_type);
   void OnDismissPictureBuffer(int32 picture_buffer_id);
   void OnInitializeDone();
   void OnPictureReady(int32 picture_buffer_id,
                       int32 bitstream_buffer_id,
                       const gfx::Size& visible_size,
                       const gfx::Size& decoded_size);
   void OnFlushDone();
   void OnResetDone();
-  void OnDestroyDone();
   void OnEndOfStream();
   void OnErrorNotification(uint32 error);
 
   // Sends IPC messages to the Gpu process.
   IPC::Message::Sender* ipc_sender_;
 
   // Route ID for the command buffer associated with the context the GPU Video
   // Decoder uses.
   // TODO(fischman): storing route_id's for GPU process entities in the renderer
   // process is vulnerable to GPU process crashing & being respawned, and
   // attempting to use an outdated or reused route id.
   int32 command_buffer_route_id_;
 
   // Helper for the command buffer associated with the context the GPU Video
   // Decoder uses.
   // TODO(fischman): in the out-of-process case, this won't work
   // (context3d->gles2_impl() will be NULL), and will have to be replaced with a
   // dedicated message such as WaitForToken, which will serialize subsequent
   // message processing behind it.
   gpu::CommandBufferHelper* cmd_buffer_helper_;
 
   // Reference to the client that will receive callbacks from the decoder.
   media::VideoDecodeAccelerator::Client* client_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuVideoDecodeAcceleratorHost);
 };
 
 #endif  // CONTENT_RENDERER_GPU_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_