Update media duration if data is appended after the previous duration

media/base/demuxer.h

Index: media/base/demuxer.h
diff --git a/media/base/demuxer.h b/media/base/demuxer.h
index 3fdc37bd44420c1162fb7ed4dc10814695d8b3bf..8c1be2d5e231457059e156d0dcd2a628d1c2b3a5 100644
--- a/media/base/demuxer.h
+++ b/media/base/demuxer.h
@@ -24,6 +24,10 @@ class MEDIA_EXPORT DemuxerHost : public DataSourceHost {
   // method with PIPELINE_OK.
   virtual void OnDemuxerError(PipelineStatus error) = 0;
 
+  // Notify the host that time range [start,end] has been buffered.
+  virtual void AddBufferedTimeRange(base::TimeDelta start,
+                                    base::TimeDelta end) = 0;
+
  protected:
   virtual ~DemuxerHost();
 };