Switch OnMoreData() to use AudioBus.

media/audio/win/waveout_output_win.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.
 
 #ifndef MEDIA_AUDIO_WIN_WAVEOUT_OUTPUT_WIN_H_
 #define MEDIA_AUDIO_WIN_WAVEOUT_OUTPUT_WIN_H_
 
 #include <windows.h>
 #include <mmsystem.h>
 #include <mmreg.h>
@@ skipping 112 matching lines @@
   // Handle returned by RegisterWaitForSingleObject().
   HANDLE waiting_handle_;
 
   // Pointer to the allocated audio buffers, we allocate all buffers in one big
   // chunk. This object owns them.
   scoped_array<char> buffers_;
 
   // Lock used to avoid the conflict when callbacks are called simultaneously.
   base::Lock lock_;
 
+  // Container for retrieving data from AudioSourceCallback::OnMoreData().
+  scoped_ptr<AudioBus> audio_bus_;
+
   DISALLOW_COPY_AND_ASSIGN(PCMWaveOutAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_WAVEOUT_OUTPUT_WIN_H_