Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/custom/constructor_calls_created_synchronously_test.dart

+// Copyright (c) 2013, 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.
+
+library constructor_calls_created_synchronously_test;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+import '../utils.dart';
+import 'dart:mirrors';
+
+class A extends HtmlElement {
+  static final tag = 'x-a';
+  factory A() => new Element.tag(tag);
+  A.created() : super.created() {
+    ncallbacks++;
+  }
+
+  static int ncallbacks = 0;
+}
+
+main() {
+  useHtmlConfiguration();
+
+  // Adapted from Blink's
+  // fast/dom/custom/constructor-calls-created-synchronously test.
+
+  var registered = false;
+  setUp(() {
+    return customElementsReady.then((_) {
+      if (!registered) {
+        registered = true;
+        document.registerElement(A.tag, A);
+      }
+    });
+  });
+
+  test('createdCallback', () {
+    var x = new A();
+    expect(A.ncallbacks, 1);
+  });
+
+  test('clone node', () {
+    A.ncallbacks = 0;
+
+    var a = new A();
+    expect(A.ncallbacks, 1);
+    var b = a.clone(false);
+    expect(A.ncallbacks, 2);
+    expect(b is A, isTrue);
+  });
+
+  test("can extend elements that don't have special prototypes", () {
+    document.registerElement('fancy-section', FancySection,
+        extendsTag: 'section');
+    var fancy = document.createElement('section', 'fancy-section');
+    expect(fancy is FancySection, true, reason: 'fancy-section was registered');
+    expect(fancy.wasCreated, true, reason: 'FancySection ctor was called');
+  });
+}
+
+class FancySection extends HtmlElement {
+  bool wasCreated = false;
+  FancySection.created() : super.created() {
+    wasCreated = true;
+  }
+}