Add WebMediaPlayer::timelineOffset() support to WebMediaPlayerImpl.

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 685e0b4a7ad048dd4db22e7e9c2a5ebb0978afd3..c0889f661cdabe89fead53f590ee7e8ce32ea9dc 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -158,6 +158,7 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   virtual void OnAudioRendererDisabled() OVERRIDE;
   virtual DemuxerStream* GetStream(DemuxerStream::Type type) OVERRIDE;
   virtual base::TimeDelta GetStartTime() const OVERRIDE;
+  virtual base::Time GetTimelineOffset() const OVERRIDE;
 
   // Methods used by an external object to control this demuxer.
   //
@@ -286,7 +287,8 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   bool CanEndOfStream_Locked() const;
 
   // SourceState callbacks.
-  void OnSourceInitDone(bool success, base::TimeDelta duration);
+  void OnSourceInitDone(bool success, base::TimeDelta duration,
+                        base::Time timeline_offset);
 
   // Creates a DemuxerStream for the specified |type|.
   // Returns a new ChunkDemuxerStream instance if a stream of this type
@@ -363,6 +365,8 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   // the actual duration instead of a user specified value.
   double user_specified_duration_;
 
+  base::Time timeline_offset_;
+
   typedef std::map<std::string, SourceState*> SourceStateMap;
   SourceStateMap source_state_map_;