Method mutate

src/service/vsync-impl.js:214–219

* Runs the mutate operation via vsync. * @param {function():undefined} mutator

(mutator)

   * @param {function():undefined} mutator
   */
  mutate(mutator) {
    this.run({
      measure: undefined, // For uniform hidden class.
      mutate: mutator,
    });
  }

  /**
   * Runs `mutate` wrapped in a promise.