constructor(coord, zoom, ownerDocument, uniqueId) {
    super(coord, zoom, ownerDocument, uniqueId);

    /** @private {!Float32Array} The binary buffer data for this tile. */
    this.buffer_;
  }
@param {!google.maps.Point} coord The position of the tile.
@param {number} zoom The zoom level of the tile.
@param {Node} ownerDocument The owner document of the tile.
@param {string} uniqueId The tile's unique ID.