Add AudioBufferStream.

media/base/video_decoder.h

Index: media/base/video_decoder.h
diff --git a/media/base/video_decoder.h b/media/base/video_decoder.h
index 66abc8c85c16f90994436985486e4eae69f5f11c..c54974c5fb4ada80a91e7f77badfb1241efda798 100644
--- a/media/base/video_decoder.h
+++ b/media/base/video_decoder.h
@@ -20,6 +20,8 @@ class VideoFrame;
 class MEDIA_EXPORT VideoDecoder {
  public:
   // Status codes for decode operations on VideoDecoder.
+  // TODO(rileya): Now that both AudioDecoder and VideoDecoder Status enums
+  // match, break them into a decoder_status.h.
   enum Status {
     kOk,  // Everything went as planned.
     kAborted,  // Decode was aborted as a result of Reset() being called.
@@ -59,6 +61,11 @@ class MEDIA_EXPORT VideoDecoder {
   virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
                       const DecodeCB& decode_cb) = 0;
 
+  // Some VideoDecoders may queue up multiple VideoFrames from a single
+  // DecoderBuffer, if we have any such queued frames this will return the next
+  // one. Otherwise we return a NULL VideoFrame.
+  virtual scoped_refptr<VideoFrame> GetDecodeOutput();
+
   // Resets decoder state, fulfilling all pending DecodeCB and dropping extra
   // queued decoded data. After this call, the decoder is back to an initialized
   // clean state.