Introduce AudioOutputResampler for browser side resampling.

media/base/audio_fifo.h

Index: media/base/audio_fifo.h
diff --git a/media/base/audio_fifo.h b/media/base/audio_fifo.h
index 83680b45bd9f58a1e302024cce633201f1c1e262..79222b84d5681f9351d522097990e67e8a13e375 100644
--- a/media/base/audio_fifo.h
+++ b/media/base/audio_fifo.h
@@ -23,13 +23,13 @@ class MEDIA_EXPORT AudioFifo {
   // Pushes all audio channel data from |source| to the FIFO.
   // Returns false if the allocated space is not sufficient.  Partial data is
   // not written to the FIFO for this overflow case.
-  bool Push(const AudioBus* source);
+  bool Push(const AudioBus* source, int frames);
 
   // Consumes |frames_to_consume| audio frames from the FIFO and copies
   // them to |destination|.
   // Returns false if the FIFO does not contain |frames_to_consume| frames
   // or if there is not sufficient space in |destination| to store the frames.
-  bool Consume(AudioBus* destination, int frames_to_consume);
+  bool Consume(AudioBus* destination, int start_frame, int frames_to_consume);
 
   // Empties the FIFO without deallocating any memory.
   void Clear();