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

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 d4eff22ff3994fcd3e4fbb759441b6af08ceceeb..246872ad3887fb04a0dc3ddae1f180808944c873 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -745,6 +745,7 @@ void ChunkDemuxerStream::CompletePendingReadIfPossible_Locked() {
 ChunkDemuxer::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)
     : state_(WAITING_FOR_INIT),
       cancel_next_seek_(false),
@@ -752,6 +753,7 @@ ChunkDemuxer::ChunkDemuxer(const base::Closure& open_cb,
       open_cb_(open_cb),
       need_key_cb_(need_key_cb),
       add_text_track_cb_(add_text_track_cb),
+      media_log_(media_log),
       log_cb_(log_cb),
       duration_(kNoTimestamp()),
       user_specified_duration_(-1) {
@@ -883,7 +885,7 @@ ChunkDemuxer::Status ChunkDemuxer::AddId(const std::string& id,
   bool has_audio = false;
   bool has_video = false;
   scoped_ptr<media::StreamParser> stream_parser(
-      StreamParserFactory::Create(type, codecs, log_cb_,
+      StreamParserFactory::Create(type, codecs, media_log_, log_cb_,
                                   &has_audio, &has_video));
 
   if (!stream_parser)