setUrls(urls) {
    this.urls = urls;
    const key = urls.join('\n');
    if (this.generateTileUrlFunction_) {
      this.setTileUrlFunction(createFromTemplates(urls, this.tileGrid), key);
    } else {
      this.setKey(key);
    }
  }
Deprecated.  Use an ImageTile source instead.
Set the URLs to use for requests.
@param {Array<string>} urls URLs.
@api