Implemented passing media track info from ffmpeg into blink

media/base/demuxer_perftest.cc

Index: media/base/demuxer_perftest.cc
diff --git a/media/base/demuxer_perftest.cc b/media/base/demuxer_perftest.cc
index 7d8a10ba1def945431ed2c82645b29311040949c..6703222bc71a700c9d71724d799d030c154cfc8f 100644
--- a/media/base/demuxer_perftest.cc
+++ b/media/base/demuxer_perftest.cc
@@ -14,6 +14,7 @@
 #include "build/build_config.h"
 #include "media/base/media.h"
 #include "media/base/media_log.h"
+#include "media/base/media_tracks.h"
 #include "media/base/test_data_util.h"
 #include "media/base/timestamp_constants.h"
 #include "media/filters/ffmpeg_demuxer.h"
@@ -54,6 +55,10 @@ static void OnEncryptedMediaInitData(EmeInitDataType init_data_type,
   VLOG(0) << "File is encrypted.";
 }
 
+static void OnMediaTracksUpdated(scoped_ptr<MediaTracks> tracks) {
+  VLOG(0) << "Got media tracks info, tracks = " << tracks->tracks().size();
+}
+
 typedef std::vector<media::DemuxerStream* > Streams;
 
 // Simulates playback reading requirements by reading from each stream
@@ -183,8 +188,11 @@ static void RunDemuxerBenchmark(const std::string& filename) {
 
     Demuxer::EncryptedMediaInitDataCB encrypted_media_init_data_cb =
         base::Bind(&OnEncryptedMediaInitData);
+    Demuxer::MediaTracksUpdatedCB tracks_updated_cb =
+        base::Bind(&OnMediaTracksUpdated);
     FFmpegDemuxer demuxer(message_loop.task_runner(), &data_source,
-                          encrypted_media_init_data_cb, new MediaLog());
+                          encrypted_media_init_data_cb, tracks_updated_cb,
+                          new MediaLog());
 
     demuxer.Initialize(&demuxer_host,
                        base::Bind(&QuitLoopWithStatus, &message_loop),