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

media/audio/android/audio_record_input.h

Index: media/audio/android/audio_record_input.h
diff --git a/media/audio/android/audio_record_input.h b/media/audio/android/audio_record_input.h
index 0a2578b107937595ca4820c151af80e1ec12cb7c..c240038360b77250e0097c2e0b6be1f3a8d8f631 100644
--- a/media/audio/android/audio_record_input.h
+++ b/media/audio/android/audio_record_input.h
@@ -12,6 +12,7 @@
 
 namespace media {
 
+class AudioBus;
 class AudioManagerAndroid;
 
 // Implements PCM audio input support for Android using the Java AudioRecord
@@ -64,6 +65,9 @@ class MEDIA_EXPORT AudioRecordInputStream : public AudioInputStream {
   // Owned by j_audio_record_.
   uint8* direct_buffer_address_;
 
+  scoped_ptr<media::AudioBus> audio_bus_;
+  int bytes_per_sample_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioRecordInputStream);
 };