Merge "MediaSession2: Remove onPlaylistChanged() without metadata" into pi-dev

                @NonNull Command command, @Nullable Bundle args,

                @Nullable ResultReceiver receiver) { }

        /**

         * Called when the playlist is changed.

         * <p>

         * If the previously playing media item is gone, you should invalidate previous playback

         * information and wait for later callbacks.

         *

         * @param controller the controller for this event

         * @param playlist A new playlist set by the session.

         * @see #onPositionChanged(MediaController2, long, long)

         * @see #onBufferedPositionChanged(MediaController2, long)

         * @see #onCurrentMediaItemChanged(MediaController2, MediaItem2)

         * @hide

         */

        // TODO(jaewan): Remove (b/74174728)

        public void onPlaylistChanged(@NonNull MediaController2 controller,

                @NonNull List<MediaItem2> playlist) { }

        /**

         * Called when the player state is changed.

         *