Refactor FFmpegDemuxerTest to use gmock and eliminate flakiness.

media/filters/ffmpeg_demuxer.h

 // Copyright (c) 2009 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.
 
 // Implements the Demuxer interface using FFmpeg's libavformat.  At this time
 // will support demuxing any audio/video format thrown at it.  The streams
 // output mime types audio/x-ffmpeg and video/x-ffmpeg and include an integer
 // key FFmpegCodecID which contains the CodecID enumeration value.  The CodecIDs
 // can be used to create and initialize the corresponding FFmpeg decoder.
 //
@@ skipping 103 matching lines @@
   // MediaFilter implementation.
   virtual void Stop();
   virtual void Seek(base::TimeDelta time);
 
   // Demuxer implementation.
   virtual bool Initialize(DataSource* data_source);
   virtual size_t GetNumberOfStreams();
   virtual scoped_refptr<DemuxerStream> GetStream(int stream_id);
 
  private:
+  // Accesses |thread_| to create a helper method used by every test.
+  friend class FFmpegDemuxerTest;
+
   // Only allow a factory to create this class.
   friend class FilterFactoryImpl0<FFmpegDemuxer>;
   FFmpegDemuxer();
   virtual ~FFmpegDemuxer();
 
   // Carries out initialization on the demuxer thread.
   void InititalizeTask(DataSource* data_source);
 
   // Carries out a seek on the demuxer thread.
   void SeekTask(base::TimeDelta time);
@@ skipping 35 matching lines @@
 
   // Thread handle.
   base::Thread thread_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_