Method getFirstMessageEventOfType

testing/iframe.js:664–671

* @param {string} type * @returns {?Event}

(type)

   * @returns {?Event}
   */
  getFirstMessageEventOfType(type) {
    for (let i = 0; i < this.events_.length; ++i) {
      if (this.events_[i].data.type === type) {
        return this.events_[i];
      }
    }
    return null;
  }

  /**
   * @param {*} data