Use Vaadin.ElementMixin

Checks Polymer version and reports usage statistics in development mode

README.md

@@ -71,3 +71,5 @@ We are using [ESLint](http://eslint.org/) for linting JavaScript code. You can c
 ## License
 
 Apache License 2.0
+
+Vaadin collects development time usage statistics to improve this product. For details and to opt-out, see https://github.com/vaadin/vaadin-usage-statistics.

bower.json

@@ -27,7 +27,8 @@
     "polymer": "^2.0.0",
     "vaadin-overlay": "#next",
     "vaadin-themable-mixin": "^1.1.0",
-    "vaadin-valo-theme": "^2.0.0"
+    "vaadin-valo-theme": "^2.0.0",
+    "vaadin-element-mixin": "vaadin/vaadin-element-mixin#^1.0.1"
   },
   "devDependencies": {
     "iron-component-page": "^3.0.0",

src/vaadin-dialog.html

@@ -6,6 +6,7 @@
 
 <link rel="import" href="../../polymer/polymer-element.html">
 <link rel="import" href="../../vaadin-overlay/vaadin-overlay.html">
+<link rel="import" href="../../vaadin-element-mixin/vaadin-element-mixin.html">
 
 <dom-module id="vaadin-dialog">
   <template>
@@ -63,13 +64,13 @@
        *
        * See [`<vaadin-overlay>` documentation](https://github.com/vaadin/vaadin-overlay/blob/master/vaadin-overlay.html)
        * for `<vaadin-dialog-overlay>` parts.
-       * 
+       *
        * See [ThemableMixin – how to apply styles for shadow parts](https://github.com/vaadin/vaadin-themable-mixin/wiki)
        *
        * @memberof Vaadin
        * @demo demo/index.html
        */
-      class VaadinDialog extends (class extends Polymer.Element {}) {
+      class VaadinDialog extends Vaadin.ElementMixin(class extends Polymer.Element {}) {
         static get is() {
           return 'vaadin-dialog';
         }
@@ -169,8 +170,7 @@
       /**
        * @namespace Vaadin
        */
-      window.Vaadin = window.Vaadin || {};
-      Vaadin.VaadinDialog = VaadinDialog;
+      window.Vaadin.VaadinDialog = VaadinDialog;
     }
   </script>
 </dom-module>