Method mark

src/service/performance-impl.js:843–845

* Add browser performance timeline entries for simple ticks. * These are for example exposed in WPT. * See https://developer.mozilla.org/en-US/docs/Web/API/Performance/mark * @param {string} label

(label)

   * @param {string} label
   */
  mark(label) {
    this.win.performance.mark?.(label);
  }

  /**
   * Tick a very specific value for the label. Use this method if you