Switch the input code to use AudioBlockFifo

media/base/audio_block_fifo.h

Index: media/base/audio_block_fifo.h
diff --git a/media/base/audio_block_fifo.h b/media/base/audio_block_fifo.h
index d3d5a8ac240a6e466a0e93d44b50d000480efbd3..fdb5cef6225664dc81974a30764c1bee983813c4 100644
--- a/media/base/audio_block_fifo.h
+++ b/media/base/audio_block_fifo.h
@@ -39,6 +39,9 @@ class MEDIA_EXPORT AudioBlockFifo {
   // Number of available block of memory ready to be consumed in the FIFO.
   int available_blocks() const { return available_blocks_; }
 
+  // Number of available frames of data in the FIFO.
+  int GetAvailableFrames() const;
+
   // Number of unfilled frames in the whole FIFO.
   int GetUnfilledFrames() const;