Adding VP8 Alpha support in Media Source

media/webm/webm_cluster_parser.h

Index: media/webm/webm_cluster_parser.h
diff --git a/media/webm/webm_cluster_parser.h b/media/webm/webm_cluster_parser.h
index 63d8626942f9ad9f4e87c245502b4826f9bf28f7..e156d47c23b15a4d516ca0dc52bee2ff36488d2e 100644
--- a/media/webm/webm_cluster_parser.h
+++ b/media/webm/webm_cluster_parser.h
@@ -110,9 +110,10 @@ class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
   virtual bool OnBinary(int id, const uint8* data, int size) OVERRIDE;
 
   bool ParseBlock(bool is_simple_block, const uint8* buf, int size,
-                  int duration);
+                  const uint8* additional, int additional_size, int duration);
   bool OnBlock(bool is_simple_block, int track_num, int timecode, int duration,
-               int flags, const uint8* data, int size);
+               int flags, const uint8* data, int size,
+               const uint8* additional, int additional_size);
 
   // Resets the Track objects associated with each text track.
   void ResetTextTracks();
@@ -133,6 +134,9 @@ class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
   scoped_ptr<uint8[]> block_data_;
   int block_data_size_;
   int64 block_duration_;
+  int64 block_add_id_;
+  scoped_ptr<uint8[]> block_additional_data_;
+  int block_additional_data_size_;
 
   int64 cluster_timecode_;
   base::TimeDelta cluster_start_time_;