NuPlayer2: send MEDIA2_INFO_DATA_SOURCE_START when starting

Test: cts testPlaylist
Bug: 109928575

Change-Id: Icc52599504c2c157f7d8ae0777c509f268eaab20
diff --git a/media/libmediaplayer2/nuplayer2/NuPlayer2.cpp b/media/libmediaplayer2/nuplayer2/NuPlayer2.cpp
index c649573..b6b9b78 100644
--- a/media/libmediaplayer2/nuplayer2/NuPlayer2.cpp
+++ b/media/libmediaplayer2/nuplayer2/NuPlayer2.cpp
@@ -1684,6 +1684,7 @@
     }
 
     startPlaybackTimer("onstart");
+    notifyListener(mSrcId, MEDIA2_INFO, MEDIA2_INFO_DATA_SOURCE_START, 0);
 
     postScanSources();
 }