Add OnMediaTimeDiscontinuity notification

Test: MediaPlayerTest
Bug: 63934228
Change-Id: I7efb58d00dc86b17b9d97775d1a2672e40e841d3
diff --git a/media/libmedia/include/media/mediaplayer.h b/media/libmedia/include/media/mediaplayer.h
index c4dbf42..2335c5a 100644
--- a/media/libmedia/include/media/mediaplayer.h
+++ b/media/libmedia/include/media/mediaplayer.h
@@ -59,6 +59,7 @@
     MEDIA_SUBTITLE_DATA     = 201,
     MEDIA_META_DATA         = 202,
     MEDIA_DRM_INFO          = 210,
+    MEDIA_TIME_DISCONTINUITY = 211,
     MEDIA_AUDIO_ROUTING_CHANGED = 10000,
 };