Cap sourceBuffered() on duration and truncate duration on EoS

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 fb53bca5596dc83392bb362a440151f4376f21be..fe8e671fddb47a4796c3bad3750427e2ba7a6eba 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -143,9 +143,16 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
       const StreamParser::BufferQueue& buffers,
       const scoped_refptr<ChunkDemuxerStream>& stream);
 
+  // Decreases |duration_| if the buffered region is less than |duration_| when
+  // EndOfStream() is called.
+  void DecreaseDurationIfNecessary();
+
   // Sets |duration_| to |new_duration| and notifies |host_|.
   void UpdateDuration(base::TimeDelta new_duration);
 
+  // Returns the ranges representing the buffered data in the demuxer.
+  Ranges<base::TimeDelta> GetBufferedRanges() const;
+
   mutable base::Lock lock_;
   State state_;