Emit Media Source stream type and codecs to chrome://media-internals.

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 cb2b72ca2b3ed566256128180b152e0da606fb9f..ac2496953ab5cc5f1084319e04460a2c8f9f1eb7 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -45,6 +45,7 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   ChunkDemuxer(const base::Closure& open_cb,
                const NeedKeyCB& need_key_cb,
                const AddTextTrackCB& add_text_track_cb,
+               const scoped_refptr<MediaLog>& media_log,
                const LogCB& log_cb);
   virtual ~ChunkDemuxer();
 
@@ -231,6 +232,9 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   base::Closure open_cb_;
   NeedKeyCB need_key_cb_;
   AddTextTrackCB add_text_track_cb_;
+
+  scoped_refptr<MediaLog> media_log_;
+
   // Callback used to report error strings that can help the web developer
   // figure out what is wrong with the content.
   LogCB log_cb_;