getTileUrl_(coord, zoom) {
    const url = data.getTileUrl(this.mapId_, coord.x, coord.y, zoom);
    if (this.profiler_ && this.profiler_.isEnabled()) {
      return url + '&profiling=1';
    }
    return url;
  }
Returns the EE source URL for the tile at the provided location.
@param {!google.maps.Point} coord The position of the tile.
@param {number} zoom The zoom level of the tile.
@return {string} The tile URL.
@private