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

test/codegen/lib/html/touchevent_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 touch_event_test;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_individual_config.dart';
+import 'dart:html';
+
+main() {
+  useHtmlIndividualConfiguration();
+
+  group('supported', () {
+    test('supported', () {
+      expect(TouchEvent.supported, true);
+    });
+  });
+
+  group('functional', () {
+    test('unsupported throws', () {
+      var expectation = TouchEvent.supported ? returnsNormally : throws;
+
+      expect(() {
+        var e = new TouchEvent(null, null, null, 'touch');
+        expect(e is TouchEvent, true);
+      }, expectation);
+    });
+  });
+}