Add support for incremental cluster parsing.

media/filters/chunk_demuxer.h

Index: media/filters/chunk_demuxer.h
diff --git a/media/filters/chunk_demuxer.h b/media/filters/chunk_demuxer.h
index b0f0d0286c057761a33c83736908c8d1360a006f..845df0872698c12d5dacb85614102aa1078e4ddc 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -81,13 +81,16 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   // found.
   bool SetupStreams();
 
-  // Parse a cluster add add the buffers to the appropriate DemxuerStream.
-  // |data| is expected to point to the beginning of a cluster element.
+  // Parse a cluster add add the buffers to the appropriate DemuxerStream.
+  // |data| is expected to point to the beginning of an element.
+  //
+  // |buffers_added| - Indicates whether Buffers were added to DemuxerStreams
+  //   during the call. This is only valid if the return value > 0.
   //
   // Returns -1 if the parse fails.
   // Returns 0 if more data is needed.
   // Returns the number of bytes parsed on success.
-  int ParseCluster_Locked(const uint8* data, int size);
+  int ParseCluster_Locked(const uint8* data, int size, bool* buffers_added);
 
   // Reports an error and puts the demuxer in a state where it won't accept more
   // data.