Method mutatedAttributesCallback

src/custom-element.js:1809–1818

* Called when one or more attributes are mutated. * Note: Must be called inside a mutate context. * Note: Boolean attributes have a value of `true` and `false` when * present and missing, respectively. * @param {!JsonObject }

(mutations)

     * @param {!JsonObject<string, (null|boolean|string|number|Array|Object)>} mutations
     */
    mutatedAttributesCallback(mutations) {
      if (this.impl_) {
        this.impl_.mutatedAttributesCallback(mutations);
      } else if (this.R1()) {
        // If amp-bind is trying to mutate an uninitialized BaseElement, it is probably about time
        // to initialize it.
        const scheduler = getSchedulerForDoc(this);
        scheduler.scheduleAsap(this);
      }
    }

    /**
     * Enqueues the action with the element. If element has been upgraded and