code: function (selector, hash) {
      if (selector !== null) {
        this.actionQueue.push(this.webdriverClient.element.bind(this.webdriverClient, selector));
      }
      this.actionQueue.push(this.webdriverClient.frame.bind(this.webdriverClient));
      this.actionQueue.push(this._frameCb.bind(this, selector, hash));
      return this;
    }
docs: Switches to frame context
  
  @method toFrame
  @param {string} selector Selector expression to find the element
  @param {string} hash Unique hash of that fn call
  @chainable