Fixing audio in mac

media/audio/mac/audio_output_mac.h

Index: media/audio/mac/audio_output_mac.h
diff --git a/media/audio/mac/audio_output_mac.h b/media/audio/mac/audio_output_mac.h
index 340e1ebd10ea8be013f45e6d7a0cb47c75467e41..07119584ec3240e0941f65771726f86d66b54bc9 100644
--- a/media/audio/mac/audio_output_mac.h
+++ b/media/audio/mac/audio_output_mac.h
@@ -56,6 +56,10 @@ class PCMQueueOutAudioOutputStream : public AudioOutputStream {
   AudioSourceCallback* source_;
   // Our creator, the audio manager needs to be notified when we close.
   AudioManagerMac* manager_;
+  // Number of bytes for make a silence buffer.
+  int silence_bytes_;
+  // Number of bytes yet to be played in audio buffer.
+  int pending_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMQueueOutAudioOutputStream);
 };