Chromecast: mitigate threading issue between AvPipeline/MediaKeys.

chromecast/media/cma/pipeline/video_pipeline_impl.h

 // Copyright 2014 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 CHROMECAST_MEDIA_CMA_BASE_VIDEO_PIPELINE_IMPL_H_
 #define CHROMECAST_MEDIA_CMA_BASE_VIDEO_PIPELINE_IMPL_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 47 matching lines @@
   void SetClient(const VideoPipelineClient& client) override;
 
  private:
   void OnFlushDone(const ::media::PipelineStatusCB& status_cb);
   void OnUpdateConfig(const ::media::AudioDecoderConfig& audio_config,
                       const ::media::VideoDecoderConfig& video_config);
   void OnNaturalSizeChanged(const gfx::Size& size);
 
   VideoPipelineDevice* video_device_;
 
-  scoped_ptr<AvPipelineImpl> av_pipeline_impl_;
+  scoped_refptr<AvPipelineImpl> av_pipeline_impl_;
   VideoPipelineClient video_client_;
 
   ::media::PipelineStatistics previous_stats_;
 
   base::WeakPtr<VideoPipelineImpl> weak_this_;
   base::WeakPtrFactory<VideoPipelineImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoPipelineImpl);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_BASE_VIDEO_PIPELINE_IMPL_H_