Add Chromium-side support for SourceBuffer.appendWindowStart and SourceBuffer.appendWindowEnd.

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 36177fb6c7daff31456085c6fd951399c908531c..0a2f67bd319979cd45394a539195ca0783ff0be7 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -135,6 +135,11 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   void MarkEndOfStream(PipelineStatus status);
   void UnmarkEndOfStream();
 
+  // Set the append window start and end values for the source buffer
+  // associated with |id|.
+  void SetAppendWindowStart(const std::string& id, base::TimeDelta start);
+  void SetAppendWindowEnd(const std::string& id, base::TimeDelta end);
+
   void Shutdown();
 
   void SetMemoryLimitsForTesting(int memory_limit);