Use the browser UI thread for audio on OSX.

media/audio/mock_audio_manager.cc

 // 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.
 
 #include "media/audio/mock_audio_manager.h"
 
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "media/audio/audio_parameters.h"
 
@@ skipping 45 matching lines @@
 }
 
 bool MockAudioManager::IsRecordingInProcess() {
   return false;
 }
 
 scoped_refptr<base::MessageLoopProxy> MockAudioManager::GetMessageLoop() {
   return message_loop_proxy_;
 }
 
+scoped_refptr<base::MessageLoopProxy> MockAudioManager::GetWorkerLoop() {
+  return message_loop_proxy_;
+}
+
 void MockAudioManager::AddOutputDeviceChangeListener(
     AudioDeviceListener* listener) {
 }
 
 void MockAudioManager::RemoveOutputDeviceChangeListener(
     AudioDeviceListener* listener) {
 }
 
 AudioParameters MockAudioManager::GetDefaultOutputStreamParameters() {
   return AudioParameters();
 }
 
 AudioParameters MockAudioManager::GetInputStreamParameters(
     const std::string& device_id) {
   return AudioParameters();
 }
 
 }  // namespace media.