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

media/audio/mac/audio_low_latency_input_mac.h

Index: media/audio/mac/audio_low_latency_input_mac.h
diff --git a/media/audio/mac/audio_low_latency_input_mac.h b/media/audio/mac/audio_low_latency_input_mac.h
index ae0c4057b945636c3473439bc6d9da7b9e92b814..7726227eae5efce056c259d35178a0bb6fd63b42 100644
--- a/media/audio/mac/audio_low_latency_input_mac.h
+++ b/media/audio/mac/audio_low_latency_input_mac.h
@@ -49,6 +49,7 @@
 
 namespace media {
 
+class AudioBus;
 class AudioManagerMac;
 class DataBuffer;
 
@@ -165,6 +166,10 @@ class AUAudioInputStream : public AgcAudioStream<AudioInputStream> {
   // Used to defer Start() to workaround http://crbug.com/160920.
   base::CancelableClosure deferred_start_cb_;
 
+  // Extra audio bus used for storage of deinterleaved data for the OnData
+  // callback.
+  scoped_ptr<media::AudioBus> audio_bus_;
+
   DISALLOW_COPY_AND_ASSIGN(AUAudioInputStream);
 };