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

test/codegen/lib/html/uri_test.dart

Index: test/codegen/lib/html/uri_test.dart
diff --git a/test/codegen/lib/html/uri_test.dart b/test/codegen/lib/html/uri_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9079884934d5b91fd1dd7e3d3f55b06cf950a7d7
--- /dev/null
+++ b/test/codegen/lib/html/uri_test.dart
@@ -0,0 +1,16 @@
+// 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.
+
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+main() {
+  useHtmlConfiguration();
+
+  test('Uri.base', () {
+    expect(Uri.base.scheme, "http");
+    expect(Uri.base.toString(), window.location.href);
+  });
+}