media: Introduce DemuxerStreamProvider interface.

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index 0ff996db7398bb3f243d602a96a02d2f3d1813bc..c5649c5788e6326f08ec0b560bcf668b3cfa9884 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -1093,6 +1093,10 @@ void ChunkDemuxer::Seek(TimeDelta time, const PipelineStatusCB& cb) {
 }
 
 // Demuxer implementation.
+base::Time ChunkDemuxer::GetTimelineOffset() const {
+  return timeline_offset_;
+}
+
 DemuxerStream* ChunkDemuxer::GetStream(DemuxerStream::Type type) {
   DCHECK_NE(type, DemuxerStream::TEXT);
   base::AutoLock auto_lock(lock_);
@@ -1105,10 +1109,6 @@ DemuxerStream* ChunkDemuxer::GetStream(DemuxerStream::Type type) {
   return NULL;
 }
 
-base::Time ChunkDemuxer::GetTimelineOffset() const {
-  return timeline_offset_;
-}
-
 Demuxer::Liveness ChunkDemuxer::GetLiveness() const {
   return liveness_;
 }