Map `PLAYER_STATE_LOADING` to `STATE_BUFFERING`

#minor-release
Issue: androidx/media#245
PiperOrigin-RevId: 510456793
(cherry picked from commit a231ff4f)

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -1235,6 +1235,7 @@ public final class CastPlayer extends BasePlayer {
     int receiverAppStatus = remoteMediaClient.getPlayerState();
     switch (receiverAppStatus) {
       case MediaStatus.PLAYER_STATE_BUFFERING:
+      case MediaStatus.PLAYER_STATE_LOADING:
         return STATE_BUFFERING;
       case MediaStatus.PLAYER_STATE_PLAYING:
       case MediaStatus.PLAYER_STATE_PAUSED:
@@ -1297,6 +1298,7 @@ public final class CastPlayer extends BasePlayer {
     return false;
   }
 
+  @SuppressWarnings("VisibleForTests")
   private static int getCastRepeatMode(@RepeatMode int repeatMode) {
     switch (repeatMode) {
       case REPEAT_MODE_ONE: