code: function (sector, level, row, column) {
              Tile.call(this, sector, level, row, column); // args are checked in the superclass' constructor
  
              /**
               * GPU cache key
               * @type {string}
               */
              this.gpuCacheKey = null;
          }
docs: Constructs a texture tile.
  @alias TextureTile
  @constructor
  @augments Tile
  @classdesc Represents an image applied to a portion of a globe's terrain. Applications typically do not
  interact with this class.
  @param {Sector} sector The sector this tile covers.
  @param {Level} level The level this tile is associated with.
  @param {Number} row This tile's row in the associated level.
  @param {Number} column This tile's column in the associated level.
  @throws {ArgumentError} If the specified sector or level is null or undefined, the row or column arguments
  are less than zero, or the specified image path is null, undefined or empty.