Function pollForLayout

testing/iframe.js:495–516

(win, count, opt_timeout)

 * @return {!Promise}
 */
export function pollForLayout(win, count, opt_timeout) {
  const getCount = () => {
    return win.document.querySelectorAll('.i-amphtml-layout,.i-amphtml-error')
      .length;
  };
  return poll(
    'Waiting for elements to layout: ' + count,
    () => {
      return getCount() >= count;
    },
    () => {
      return new Error(
        'Failed to find elements with layout.' +
          ' Current count: ' +
          getCount() +
          ' HTML:\n' +
          win.document.documentElement./*TEST*/ innerHTML
      );
    },
    opt_timeout
  );
}

/**
 * @param {!Window} win