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

test/codegen/lib/html/window_test.dart

Index: test/codegen/lib/html/window_test.dart
diff --git a/test/codegen/lib/html/window_test.dart b/test/codegen/lib/html/window_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..51ccdfd950a43f61932f6ee3862576c968a3b70e
--- /dev/null
+++ b/test/codegen/lib/html/window_test.dart
@@ -0,0 +1,17 @@
+// 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 WindowTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+main() {
+  useHtmlConfiguration();
+
+  test('scrollXY', () {
+    expect(window.scrollX, 0);
+    expect(window.scrollY, 0);
+  });
+}