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

test/codegen/html_config.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.
 
-class BootstrapTest {
+/// A simple unit test library for running tests in a browser.
+library unittest.html_config;
 
-  static testMain() {
-    var obj = new Object();
-
-    return obj;
-  }
-
-}
-
-main() {
-  BootstrapTest.testMain();
-}
+// void useHtmlConfiguration([bool isLayoutTest = false]) { }