code: function( options ) {
      $.console.assert( options, "[TileCache.cacheTile] options is required" );
      $.console.assert( options.tile, "[TileCache.cacheTile] options.tile is required" );
      $.console.assert( options.tiledImage, "[TileCache.cacheTile] options.tiledImage is required" );
      this.tile = options.tile;
      this.tiledImage = options.tiledImage;
  }
docs: private class