Prevent AudioDeviceThread from starting if clients have called Stop() (round 2).

media/audio/audio_output_device.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.
 //
 // Audio rendering unit utilizing audio output stream provided by browser
 // process through IPC.
 //
 // Relationship of classes.
 //
 //  AudioOutputController                AudioOutputDevice
@@ skipping 142 matching lines @@
 
   // Our audio thread callback class.  See source file for details.
   class AudioThreadCallback;
 
   // In order to avoid a race between OnStreamCreated and Stop(), we use this
   // guard to control stopping and starting the audio thread.
   base::Lock audio_thread_lock_;
   AudioDeviceThread audio_thread_;
   scoped_ptr<AudioOutputDevice::AudioThreadCallback> audio_callback_;
 
+  // Temporary hack to ignore OnStreamCreated() due to the user calling Stop()
+  // so we don't start the audio thread pointing to a potentially freed
+  // |callback_|.
+  //
+  // TODO(scherkus): Replace this by changing AudioRendererSink to either accept
+  // the callback via Start(). See http://crbug.com/151051 for details.
+  bool stopping_hack_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_