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

ppapi/cpp/dev/video_decoder_client_dev.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 PPAPI_CPP_DEV_VIDEO_DECODER_CLIENT_DEV_H_
 #define PPAPI_CPP_DEV_VIDEO_DECODER_CLIENT_DEV_H_
 
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/dev/pp_video_dev.h"
 
 namespace pp {
 
 class Instance;
 class VideoDecoder_Dev;
 
 // This class provides a C++ interface for callbacks related to video decoding.
 // It is the C++ counterpart to PPP_VideoDecoder_Dev.
 // You would normally use multiple inheritance to derive from this class in your
 // instance.
 class VideoDecoderClient_Dev {
  public:
   VideoDecoderClient_Dev(Instance* instance);
   virtual ~VideoDecoderClient_Dev();
 
   // Callback to provide buffers for the decoded output pictures.
   virtual void ProvidePictureBuffers(
-      VideoDecoder_Dev decoder,
       uint32_t req_num_of_bufs,
       struct PP_Size dimensions,
       enum PP_PictureBufferType_Dev type) = 0;
 
-  // Callback for decoder to delivered unneeded picture buffers back to the
+  // Callback for decoder to deliver unneeded picture buffers back to the
   // plugin.
-  virtual void DismissPictureBuffer(
-      VideoDecoder_Dev decoder,
-      int32_t picture_buffer_id) = 0;
+  virtual void DismissPictureBuffer(int32_t picture_buffer_id) = 0;
 
   // Callback to deliver decoded pictures ready to be displayed.
-  virtual void PictureReady(
-      VideoDecoder_Dev decoder,
-      const PP_Picture_Dev& picture) = 0;
+  virtual void PictureReady(const PP_Picture_Dev& picture) = 0;
 
   // Callback to notify that decoder has decoded end of stream marker and has
   // outputted all displayable pictures.
-  virtual void EndOfStream(VideoDecoder_Dev decoder) = 0;
+  virtual void EndOfStream() = 0;
 
   // Callback to notify about decoding errors.
-  virtual void NotifyError(
-      VideoDecoder_Dev decoder, PP_VideoDecodeError_Dev error) = 0;
+  virtual void NotifyError(PP_VideoDecodeError_Dev error) = 0;
 
  private:
   Instance* associated_instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VIDEO_DECODER_CLIENT_DEV_H_