Ensure DisableUpgradeMixin extends PropertiesMixin

lib/mixins/disable-upgrade-mixin.html

@@ -35,16 +35,30 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
    *
    * @mixinFunction
    * @polymer
+   * @appliesMixin Polymer.PropertiesChanged
    * @memberof Polymer
    */
-  Polymer.DisableUpgradeMixin = (base) => {
+  Polymer.DisableUpgradeMixin = Polymer.dedupingMixin((base) => {
 
-    return class DisableUpgradeClass extends base {
+    /**
+     * @constructor
+     * @extends {base}
+     * @implements {Polymer_PropertiesMixin}
+     */
+    const superClass = Polymer.PropertiesMixin(base);
+    /**
+     * @polymer
+     * @mixinClass
+     * @implements {Polymer_DisableUpgradeMixin}
+     */
+    class DisableUpgradeClass extends superClass {
 
+      /** @override */
       static get observedAttributes() {
         return super.observedAttributes.concat(DISABLED_ATTR);
       }
 
+      /** @override */
       attributeChangedCallback(name, old, value) {
         if (name == DISABLED_ATTR) {
           if (!this.__dataEnabled && value == null && this.isConnected) {
@@ -60,9 +74,11 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         attributes are delivered. Therefore, we stub this out and
         call `super._initializeProperties()` manually.
       */
+     /** @override */
       _initializeProperties() {}
 
       // prevent user code in connected from running
+      /** @override */
       connectedCallback() {
         if (this.__dataEnabled || !this.hasAttribute(DISABLED_ATTR)) {
           super.connectedCallback();
@@ -70,6 +86,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       }
 
       // prevent element from turning on properties
+      /** @override */
       _enableProperties() {
         if (!this.hasAttribute(DISABLED_ATTR)) {
           if (!this.__dataEnabled) {
@@ -80,15 +97,18 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       }
 
       // only go if "enabled"
+      /** @override */
       disconnectedCallback() {
         if (this.__dataEnabled) {
           super.disconnectedCallback();
         }
       }
 
-    };
+    }
 
-  };
+    return DisableUpgradeClass;
+
+  });
 
 })();