estContentfulPaint, "LargestContentfulPaint is not implemented");
    let destUrl = get_host_info().HTTP_REMOTE_ORIGIN
        + '/element-timing/resources/multiple-redirects.py?';
    destUrl += 'redirect_count=2';
    // The final resource has '*' in TAO header, so will not affect the result.
    destUrl += '&final_resource=/element-timing/resources/circle-tao.svg';
    destUrl += '&origin1=' + get_host_info().UNAUTHENTICATED_ORIGIN;
    destUrl += '&origin2=' + get_host_info().HTTP_REMOTE_ORIGIN;
    con