AudioManagerBase: Create and run the audio thread lazily.

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/single_thread_task_runner.h"
 #include "media/audio/audio_parameters.h"
 
@@ skipping 45 matching lines @@
   return NULL;
 }
 
 media::AudioInputStream* MockAudioManager::MakeAudioInputStream(
     const media::AudioParameters& params,
     const std::string& device_id) {
   NOTREACHED();
   return NULL;
 }
 
-scoped_refptr<base::SingleThreadTaskRunner> MockAudioManager::GetTaskRunner()
-    const {
+scoped_refptr<base::SingleThreadTaskRunner> MockAudioManager::GetTaskRunner() {
   return task_runner_;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 MockAudioManager::GetWorkerTaskRunner() {
   return task_runner_;
 }
 
 void MockAudioManager::AddOutputDeviceChangeListener(
     AudioDeviceListener* listener) {
@@ skipping 21 matching lines @@
     const std::string& input_device_id) {
   return std::string();
 }
 
 scoped_ptr<AudioLog> MockAudioManager::CreateAudioLog(
     AudioLogFactory::AudioComponent component) {
   return scoped_ptr<AudioLog>();
 }
 
 }  // namespace media.