Method isUpgraded

src/custom-element.js:347–349

* Whether the element has been upgraded yet. Always returns false when * the element has not yet been added to DOM. After the element has been * added to DOM, the value depends on the `BaseElement` implementation and * its `upgradeElement` callback. * @return {boolean} * @fi

()

     * @final
     */
    isUpgraded() {
      return this.upgradeState_ == UpgradeState_Enum.UPGRADED;
    }

    /** @return {!Promise} */
    whenUpgraded() {