Fixing a bunch of dartc errors in dart:html tests.

tests/html/util.dart

Index: tests/html/util.dart
diff --git a/tests/html/util.dart b/tests/html/util.dart
index 945158133ff31eb9e16fdbdcb5d3fa455185f9b0..25bb5022f80a870db21e4f03207f3237628a547f 100644
--- a/tests/html/util.dart
+++ b/tests/html/util.dart
@@ -2,6 +2,11 @@
 // 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 test.html.util;
+
+import 'dart:html';
+import '../../pkg/unittest/lib/unittest.dart';
+
 void expectUnsupported(f) => expect(f, throwsUnsupportedError);
 
 void expectEmptyRect(ClientRect rect) {