Moved the fake input stream's processing onto the audio worker thread.

media/audio/null_audio_sink.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 MEDIA_AUDIO_NULL_AUDIO_SINK_H_
 #define MEDIA_AUDIO_NULL_AUDIO_SINK_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "media/base/audio_renderer_sink.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 class AudioBus;
 class AudioHash;
-class FakeAudioConsumer;
+class FakeAudioWorker;
 
 class MEDIA_EXPORT NullAudioSink
     : NON_EXPORTED_BASE(public AudioRendererSink) {
  public:
   NullAudioSink(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
   // AudioRendererSink implementation.
   void Initialize(const AudioParameters& params,
                   RenderCallback* callback) override;
   void Start() override;
   void Stop() override;
   void Pause() override;
   void Play() override;
   bool SetVolume(double volume) override;
 
   // Enables audio frame hashing.  Must be called prior to Initialize().
   void StartAudioHashForTesting();
 
   // Returns the hash of all audio frames seen since construction.
   std::string GetAudioHashForTesting();
 
  protected:
   ~NullAudioSink() override;
 
  private:
   // Task that periodically calls Render() to consume audio data.
-  void CallRender(AudioBus* audio_bus);
+  void CallRender();
 
   bool initialized_;
   bool playing_;
   RenderCallback* callback_;
 
   // Controls whether or not a running hash is computed for audio frames.
   scoped_ptr<AudioHash> audio_hash_;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_ptr<FakeAudioConsumer> fake_consumer_;
+  scoped_ptr<FakeAudioWorker> fake_worker_;
+  scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_NULL_AUDIO_SINK_H_