Modifies AudioInputCallback::OnData and use media::AudioBus instead of plain byte vector (Relanding)

media/audio/pulse/pulse_output.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.
 //
 // Creates an audio output stream based on the PulseAudio asynchronous API;
 // specifically using the pa_threaded_mainloop model.
 //
 // If the stream is successfully opened, Close() must be called before the
 // stream is deleted as Close() is responsible for ensuring resource cleanup
 // occurs.
 //
 // This object is designed so that all AudioOutputStream methods will be called
 // on the same thread that created the object.
 //
 // WARNING: This object blocks on internal PulseAudio calls in Open() while
 // waiting for PulseAudio's context structure to be ready.  It also blocks in
 // inside PulseAudio in Start() and repeated during playback, waiting for
 // PulseAudio write callbacks to occur.
 
 #ifndef MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_
 #define MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 struct pa_context;
 struct pa_operation;
 struct pa_stream;
 struct pa_threaded_mainloop;
 
 namespace media {
 class AudioManagerBase;
@@ skipping 47 matching lines @@
   // Float representation of volume from 0.0 to 1.0.
   float volume_;
 
   // Callback to audio data source.  Must only be modified while holding a lock
   // on |pa_mainloop_| via pa_threaded_mainloop_lock().
   AudioSourceCallback* source_callback_;
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
   scoped_ptr<AudioBus> audio_bus_;
 
+  base::ThreadChecker thread_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_