getLoadingTilesCount() {
    return (
        this.getTileCountForStatus_(ee.layers.AbstractTile.Status.THROTTLED) +
        this.getTileCountForStatus_(ee.layers.AbstractTile.Status.LOADING) +
        this.getTileCountForStatus_(ee.layers.AbstractTile.Status.NEW));
  }
@return {number} The number of tiles yet to be loaded. Includes tiles
    with the status NEW or LOADING or THROTTLED.