Chrome-side implementation of media source timestamp offset

media/webm/webm_stream_parser.h

Index: media/webm/webm_stream_parser.h
diff --git a/media/webm/webm_stream_parser.h b/media/webm/webm_stream_parser.h
index f5552781bb2a0cf96464d0af02475f3f6147b7ca..7cdcbc212ae8de1f2381b278a96576fadb7da321 100644
--- a/media/webm/webm_stream_parser.h
+++ b/media/webm/webm_stream_parser.h
@@ -29,6 +29,8 @@ class WebMStreamParser : public StreamParser {
                     const NewMediaSegmentCB& new_segment_cb) OVERRIDE;
   virtual void Flush() OVERRIDE;
   virtual bool Parse(const uint8* buf, int size) OVERRIDE;
+  virtual void SetTimestampOffset(base::TimeDelta offset) OVERRIDE;
+  virtual void ClearTimestampOffset() OVERRIDE;
 
  private:
   enum State {
@@ -74,6 +76,8 @@ class WebMStreamParser : public StreamParser {
   scoped_ptr<WebMClusterParser> cluster_parser_;
   ByteQueue byte_queue_;
 
+  base::TimeDelta timestamp_offset_;
+
   DISALLOW_COPY_AND_ASSIGN(WebMStreamParser);
 };