update elements and fix some bugs

test/iron_list_hidden_test.dart

Index: test/iron_list_hidden_test.dart
diff --git a/test/iron_list_hidden_test.dart b/test/iron_list_hidden_test.dart
index 9c2cc23a5e87d010da9a3f5c7371b563cb022529..0beb0c1e57a0c4076df353320fb47b853a88e775 100644
--- a/test/iron_list_hidden_test.dart
+++ b/test/iron_list_hidden_test.dart
@@ -34,17 +34,17 @@ main() async {
       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);