Method toggleLoading

src/custom-element.js:2052–2071

* Turns the loading indicator on or off. * @param {boolean} state * @param {boolean=} force * @public @final

(state, force = false)

     * @public @final
     */
    toggleLoading(state, force = false) {
      // TODO(dvoytenko, #9177): cleanup `this.ownerDocument.defaultView`
      // once investigation is complete. It appears that we get a lot of
      // errors here once the iframe is destroyed due to timer.
      if (!this.ownerDocument || !this.ownerDocument.defaultView) {
        return;
      }

      const loadingIndicator = Services.loadingIndicatorOrNull(
        this.getAmpDoc()
      );
      if (loadingIndicator) {
        state = state && this.isLoadingEnabled_(force);
        if (state) {
          loadingIndicator.track(this);
        } else {
          loadingIndicator.untrack(this);
        }
      }
    }

    /**
     * Returns an optional overflow element for this custom element.