Fix muted audio when playback rate != 1.0 or 0.0

media/filters/null_audio_renderer.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.
 
 #ifndef MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
 #define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
 
 // NullAudioRenderer effectively uses an extra thread to "throw away" the
 // audio data at a rate resembling normal playback speed.  It's just like
 // decoding to /dev/null!
@@ skipping 34 matching lines @@
   void FillBufferTask();
 
   // A number to convert bytes written in FillBuffer to milliseconds based on
   // the audio format.
   size_t bytes_per_millisecond_;
 
   // A buffer passed to FillBuffer to advance playback.
   scoped_array<uint8> buffer_;
   size_t buffer_size_;
 
+  size_t bytes_per_frame_;
+
   // Separate thread used to throw away data.
   base::Thread thread_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_