update elements and fix some bugs

test/iron_iconset_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 @TestOn('browser')
 library polymer_elements.test.iron_iconset_test;
 
+import 'dart:html';
+import 'package:polymer_interop/polymer_interop.dart';
 import 'package:polymer_elements/iron_iconset.dart';
 import 'package:test/test.dart';
 import 'package:web_components/web_components.dart';
 import 'common.dart';
 
 /// Used imports: [IronIconset]
 main() async {
   await initWebComponents();
 
   group('<iron-iconset>', () {
     group('basic behavior', () {
       var iconset;
       var meta;
 
       setUp(() {
         var elements = fixture('TrivialIconset');
         iconset = elements[0];
         meta = elements[1];
       });
 
       test('it can be accessed via iron-meta', () {
         expect(meta.byKey('foo'), iconset);
       });
+
+      test('it fires an iron-iconset-added event on the window', () {
+        return window.on['iron-iconset-added'].first.then((ev) {
+          ev = convertToDart(ev);
+          expect(ev, isNotNull);
+          expect(ev.detail, iconset);
+        });
+      });
     });
     group('when src, width, iconSize and icons are assigned', () {
       var iconset;
       var div;
 
       setUp(() {
         var elements = fixture('StandardIconset');
         iconset = elements[0];
         div = elements[1];
       });
@@ skipping 38 matching lines @@
       test('adjusts the icon by the theme offset', () {
         var iconStyle;
         iconset.applyIcon(div, 'bus', 'large', null);
         iconStyle = div.getComputedStyle();
         expect(
             iconStyle.backgroundPosition, contains(new RegExp(r'-10px -34px')));
       });
     });
   });
 }