Adding Element.created constructor

tests/html/custom/document_register_basic_test.dart

Index: tests/html/custom/document_register_basic_test.dart
diff --git a/tests/html/custom/document_register_basic_test.dart b/tests/html/custom/document_register_basic_test.dart
index c8964e5127c10e276cef280460fe580113c8d00f..efed07287b2359982b2013c0b3b150fcb1702dd9 100644
--- a/tests/html/custom/document_register_basic_test.dart
+++ b/tests/html/custom/document_register_basic_test.dart
@@ -11,6 +11,7 @@ import '../utils.dart';
 class Foo extends HtmlElement {
   static final tag = 'x-foo';
   factory Foo() => new Element.tag(tag);
+  Foo.created() : super.created();
 
   get thisIsACustomClass => true;
 }
@@ -18,6 +19,7 @@ class Foo extends HtmlElement {
 class Bar extends HtmlElement {
   static final tag = 'x-bar';
   factory Bar() => new Element.tag(tag);
+  Bar.created() : super.created();
 
   get thisIsACustomClass => true;
 }
@@ -25,6 +27,7 @@ class Bar extends HtmlElement {
 class Baz extends Foo {
   static final tag = 'x-baz';
   factory Baz() => new Element.tag(tag);
+  Baz.created() : super.created();
 
   get thisIsAlsoACustomClass => true;
 }
@@ -35,6 +38,7 @@ class BadB {
 class BadE implements HtmlElement {
   static final tag = 'x-tag-e';
   factory BadE() => new Element.tag(tag);
+  BadE.created() : super.created();
 }
 
 main() {