EME: Handle NO_KEY and resume playback after key is added.

media/base/android/media_player_android.cc

Index: media/base/android/media_player_android.cc
diff --git a/media/base/android/media_player_android.cc b/media/base/android/media_player_android.cc
index 6b1626a2b6442ad704e0e31d4ed17af4ce008a6d..ab249acf02f119ae57f99feb93e00545f8ba074a 100644
--- a/media/base/android/media_player_android.cc
+++ b/media/base/android/media_player_android.cc
@@ -92,4 +92,9 @@ void MediaPlayerAndroid::SetDrmBridge(MediaDrmBridge* drm_bridge) {
   return;
 }
 
+void MediaPlayerAndroid::OnKeyAdded() {
+  // Not all players care about the decryption key. Do nothing by default.
+  return;
+}
+
 }  // namespace media