Method mutatePromise

src/service/vsync-impl.js:226–231

* Runs `mutate` wrapped in a promise. * @param {function():undefined} mutator * @return {!Promise}

(mutator)

   * @return {!Promise}
   */
  mutatePromise(mutator) {
    return this.runPromise({
      measure: undefined,
      mutate: mutator,
    });
  }

  /**
   * Runs the measure operation via vsync.