NuPlayer2: add srcId for source.

Also add prepareNextDataSource for playlist.
Test: MediaPlayer2 plays
Bug: 63934228
Change-Id: I7386b60019323b36632f3b3275c4513433ee6e2e
diff --git a/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h b/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h
index 35186ed..8e188eb 100644
--- a/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h
+++ b/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h
@@ -83,10 +83,11 @@
     // 0xx
     MEDIA2_ERROR_UNKNOWN = 1,
     // 1xx
-    MEDIA2_ERROR_SERVER_DIED = 100,
+    // MEDIA2_ERROR_SERVER_DIED = 100,
     // 2xx
     MEDIA2_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK = 200,
     // 3xx
+    MEDIA2_ERROR_FAILED_TO_SET_DATA_SOURCE = 300,
 };