Function waitFor

testing/helpers/service.js:82–89

(callback, errorMessage)

 * @return {!Promise}
 */
export function waitFor(callback, errorMessage) {
  return poll(
    errorMessage,
    callback,
    undefined /* opt_onError */,
    200 /* opt_timeout */
  );
}

/**
 * Gets the initial values of an Element's animation state.