update elements and fix some bugs

test/iron_list_hidden_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_list_hidden_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:js';
 import 'package:polymer/polymer.dart';
@@ skipping 16 matching lines @@
       list = container.list;
     });
 
     test('list size', () async {
       list.items = buildDataSet(100);
       await wait(1);
       expect(list.offsetWidth, 0);
       expect(list.offsetHeight, 0);
     });
 
-    test('resize', () {
+    test('iron-resize', () {
       var done = new Completer();
       list.items = buildDataSet(100);
-      list.fire('resize');
+      list.fire('iron-resize');
 
       expect(getFirstItemFromList(list).text, isNot('0'));
       context['Polymer']['RenderStatus'].callMethod('whenReady', [() async {
         container.attributes.remove('hidden');
 
         expect(getFirstItemFromList(list).text, isNot('0'));
-        list.fire('resize');
+        list.fire('iron-resize');
         await wait(1);
 
         expect(list.jsElement['isAttached'], isTrue);
         expect(getFirstItemFromList(list).text, '0');
         done.complete();
       }]);
 
       return done.future;
     });
   });
 }