Use the browser UI thread for audio on OSX.

media/audio/mock_audio_manager.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_MOCK_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_
 
 #include "media/audio/audio_manager.h"
 
 namespace media {
@@ skipping 31 matching lines @@
       const media::AudioParameters& params,
       const std::string& input_device_id) OVERRIDE;
 
   virtual media::AudioInputStream* MakeAudioInputStream(
       const media::AudioParameters& params,
       const std::string& device_id) OVERRIDE;
 
   virtual bool IsRecordingInProcess() OVERRIDE;
 
   virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoop() OVERRIDE;
+  virtual scoped_refptr<base::MessageLoopProxy> GetWorkerLoop() OVERRIDE;
 
   virtual void AddOutputDeviceChangeListener(
       AudioDeviceListener* listener) OVERRIDE;
   virtual void RemoveOutputDeviceChangeListener(
       AudioDeviceListener* listener) OVERRIDE;
 
   virtual AudioParameters GetDefaultOutputStreamParameters() OVERRIDE;
   virtual AudioParameters GetInputStreamParameters(
       const std::string& device_id) OVERRIDE;
 
  private:
   virtual ~MockAudioManager();
 
   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(MockAudioManager);
 };
 
 }  // namespace media.
 
 #endif  // MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_