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

media/audio/win/wavein_input_win.h

Index: media/audio/win/wavein_input_win.h
diff --git a/media/audio/win/wavein_input_win.h b/media/audio/win/wavein_input_win.h
index df5ce4d129bcf29fdc0ebc4e9e445372007a90a2..5b1edd59fb363f8e07f8db8a93d9fe9201ccb95c 100644
--- a/media/audio/win/wavein_input_win.h
+++ b/media/audio/win/wavein_input_win.h
@@ -20,6 +20,7 @@
 
 namespace media {
 
+class AudioBus;
 class AudioManagerWin;
 
 class PCMWaveInAudioInputStream : public AudioInputStream {
@@ -123,6 +124,10 @@ class PCMWaveInAudioInputStream : public AudioInputStream {
   // Lock used to avoid conflicts when Stop() is called during a callback.
   base::Lock lock_;
 
+  // Extra audio bus used for storage of deinterleaved data for the OnData
+  // callback.
+  scoped_ptr<media::AudioBus> audio_bus_;
+
   DISALLOW_COPY_AND_ASSIGN(PCMWaveInAudioInputStream);
 };