Switch OnMoreData() to use AudioBus.

media/audio/linux/cras_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 output stream based on the cras (ChromeOS audio server) interface.
 //
 // CrasOutputStream object is *not* thread-safe and should only be used
 // from the audio thread.
 
 #ifndef MEDIA_AUDIO_LINUX_CRAS_OUTPUT_H_
@@ skipping 98 matching lines @@
 
   // Volume level from 0.0 to 1.0.
   float volume_;
 
   // Audio manager that created us.  Used to report that we've been closed.
   AudioManagerLinux* manager_;
 
   // Callback to get audio samples.
   AudioSourceCallback* source_callback_;
 
+  // Container for retrieving data from AudioSourceCallback::OnMoreData().
+  scoped_ptr<AudioBus> audio_bus_;
+
   DISALLOW_COPY_AND_ASSIGN(CrasOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_LINUX_CRAS_OUTPUT_H_