Initial CL for the timed text support:
- Add support for MP4 timed text
- Add API for app to turn on/off a text track
- Add timed text metadata(language) in the MediaMetadataRetriever

Change-Id: I0055beba38ac761627dbcc6d581ae9582d68bb94
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index 241626c..cfa4cfd 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -125,6 +125,9 @@
     MEDIA_PLAYER_PLAYBACK_COMPLETE  = 1 << 7
 };
 
+enum media_set_parameter_keys {
+    KEY_PARAMETER_TIMED_TEXT_TRACK_INDEX = 1000,
+};
 // ----------------------------------------------------------------------------
 // ref-counted object for callbacks
 class MediaPlayerListener: virtual public RefBase