Listen to playWhenReady changes in LeanbackPlayerAdapter

#minor-release

Issue: #10420
PiperOrigin-RevId: 460223064
(cherry picked from commit c43d9f5)

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -234,11 +234,6 @@ public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
 
     // Player.Listener implementation.
 
-    @Override
-    public void onPlaybackStateChanged(@Player.State int playbackState) {
-      notifyStateChanged();
-    }
-
     @Override
     public void onPlayerError(PlaybackException error) {
       Callback callback = getCallback();
@@ -283,5 +278,13 @@ public void onVideoSizeChanged(VideoSize videoSize) {
       int scaledWidth = Math.round(videoSize.width * videoSize.pixelWidthHeightRatio);
       getCallback().onVideoSizeChanged(LeanbackPlayerAdapter.this, scaledWidth, videoSize.height);
     }
+
+    @Override
+    public void onEvents(Player player, Player.Events events) {
+      if (events.containsAny(
+          Player.EVENT_PLAY_WHEN_READY_CHANGED, Player.EVENT_PLAYBACK_STATE_CHANGED)) {
+        notifyStateChanged();
+      }
+    }
   }
 }