Implemented passing media track info from ffmpeg into blink

media/blink/webmediaplayer_impl.h

Index: media/blink/webmediaplayer_impl.h
diff --git a/media/blink/webmediaplayer_impl.h b/media/blink/webmediaplayer_impl.h
index 73a1ce9e14c5591a87b77d9144a2cd9bd527d8b9..35c607491251625077edb418d8cfb5fba266824c 100644
--- a/media/blink/webmediaplayer_impl.h
+++ b/media/blink/webmediaplayer_impl.h
@@ -18,6 +18,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread.h"
 #include "build/build_config.h"
+#include "media/base/media_tracks.h"
 #include "media/base/pipeline_impl.h"
 #include "media/base/renderer_factory.h"
 #include "media/base/surface_manager.h"
@@ -261,6 +262,9 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   void OnEncryptedMediaInitData(EmeInitDataType init_data_type,
                                 const std::vector<uint8_t>& init_data);
 
+  // Called when the demuxer encounters new media tracks.
+  void OnMediaTracksUpdated(scoped_ptr<MediaTracks> tracks);
+
   // Called when a decoder detects that the key needed to decrypt the stream
   // is not available.
   void OnWaitingForDecryptionKey();
@@ -454,6 +458,9 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   // This will be null everywhere but Android.
   SurfaceManager* surface_manager_;
 
+  std::vector<blink::WebMediaPlayer::TrackId> blink_audio_tracks_;
+  std::vector<blink::WebMediaPlayer::TrackId> blink_video_tracks_;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };