MediaResource refactoring to support multiple streams

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 1edff064182e70886fadbf469cb46652ecad3123..05e280b515ad346cbe9873a06f591933ea068a5d 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -482,26 +482,17 @@ base::Time ChunkDemuxer::GetTimelineOffset() const {
   return timeline_offset_;
 }
 
-DemuxerStream* ChunkDemuxer::GetStream(DemuxerStream::Type type) {
-  DCHECK_NE(type, DemuxerStream::TEXT);
+std::vector<DemuxerStream*> ChunkDemuxer::GetStreams() {
   base::AutoLock auto_lock(lock_);
 
-  // TODO(servolk): For now return only the first enabled audio/video stream,
-  // since this GetStream method is part of the implementation of the
-  // DemuxerStreamProvider interface that is used in many places and can't be
-  // changed easily. It will be fixed later, when we add support for multiple
-  // streams/tracks in DemuxerStreamProvider, tracked by crbug.com/646669
-  if (type == DemuxerStream::AUDIO)
-    for (const auto& s : audio_streams_)
-      if (s->enabled())
-        return s.get();
+  std::vector<DemuxerStream*> result;
+  for (const auto& s : audio_streams_)
+    result.push_back(s.get());
 
-  if (type == DemuxerStream::VIDEO)
-    for (const auto& s : video_streams_)
-      if (s->enabled())
-        return s.get();
+  for (const auto& s : video_streams_)
+    result.push_back(s.get());
 
-  return NULL;
+  return result;
 }
 
 TimeDelta ChunkDemuxer::GetStartTime() const {