handle the case when device is closed before media pipeline is fully initialized.

content/renderer/media/capture_video_decoder.h

 // Copyright (c) 2012 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_MEDIA_CAPTURE_VIDEO_DECODER_H_
 #define CONTENT_RENDERER_MEDIA_CAPTURE_VIDEO_DECODER_H_
 
 #include "base/time.h"
 #include "content/common/content_export.h"
 #include "media/base/pipeline_status.h"
@@ skipping 58 matching lines @@
 
   void InitializeOnDecoderThread(
       const scoped_refptr<media::DemuxerStream>& stream,
       const media::PipelineStatusCB& status_cb,
       const media::StatisticsCB& statistics_cb);
   void ReadOnDecoderThread(const ReadCB& read_cb);
   void ResetOnDecoderThread(const base::Closure& closure);
   void StopOnDecoderThread(const base::Closure& closure);
 
   void OnStoppedOnDecoderThread(media::VideoCapture* capture);
+  void OnPausedOnDecoderThread(media::VideoCapture* capture);
   void OnBufferReadyOnDecoderThread(
       media::VideoCapture* capture,
       scoped_refptr<media::VideoCapture::VideoFrameBuffer> buf);
   void OnDeviceInfoReceivedOnDecoderThread(
       media::VideoCapture* capture,
       const media::VideoCaptureParams& device_info);
 
   // Delivers the frame to |read_cb_| and resets the callback.
   void DeliverFrame(const scoped_refptr<media::VideoFrame>& video_frame);
 
   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
   scoped_refptr<VideoCaptureImplManager> vc_manager_;
   media::VideoCaptureCapability capability_;
   gfx::Size natural_size_;
   DecoderState state_;
   bool got_first_frame_;
   ReadCB read_cb_;
   base::Closure pending_stop_cb_;
   media::StatisticsCB statistics_cb_;
 
   media::VideoCaptureSessionId video_stream_id_;
   media::VideoCapture* capture_engine_;
   base::Time last_frame_timestamp_;
   base::Time start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(CaptureVideoDecoder);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_CAPTURE_VIDEO_DECODER_H_