Use audio thread for the fake input audio stream.

media/audio/fake_audio_input_stream.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.
 //
 // A fake implementation of AudioInputStream, useful for testing purpose.
 
 #ifndef MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
 #define MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
 
 #include <vector>
@@ skipping 43 matching lines @@
 
   virtual ~FakeAudioInputStream();
 
   void DoCallback();
 
   AudioManagerBase* audio_manager_;
   AudioInputCallback* callback_;
   scoped_ptr<uint8[]> buffer_;
   int buffer_size_;
   AudioParameters params_;
-  base::Thread thread_;
+  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::TimeTicks last_callback_time_;
   base::TimeDelta callback_interval_;
   base::TimeDelta interval_from_last_beep_;
   int beep_duration_in_buffers_;
   int beep_generated_in_buffers_;
   int beep_period_in_frames_;
   int frames_elapsed_;
   scoped_ptr<media::AudioBus> audio_bus_;
 
+  // Allows us to run tasks on the FakeAudioInputStream instance which are
+  // bound by its lifetime.
+  base::WeakPtrFactory<FakeAudioInputStream> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_