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

test/codegen/lib/html/window_mangling_test.dart

+// Copyright (c) 2012, 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 WindowManglingTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html' as dom;
+
+// Defined in dom.Window.
+get navigator => "Dummy";
+
+$eq(x, y) => false;
+$eq$(x, y) => false;
+
+main() {
+  useHtmlConfiguration();
+  var win = dom.window;
+
+  test('windowMethod', () {
+      final message = navigator;
+      final x = win.navigator;
+      expect(x, isNot(equals(message)));
+    });
+
+  test('windowEquals', () {
+      expect($eq(win, win), isFalse);
+      expect(win == win, isTrue);
+    });
+
+  test('windowEquals', () {
+      expect($eq$(win, win), isFalse);
+      expect(win == win, isTrue);
+    });
+}