Add constructors to all the event classes.

client/tests/client/html/html_tests.dart

 // Copyright (c) 2011, 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('layout_tests');
 
 #import('../../../base/base.dart');
 #import('../../../html/html.dart');
 #import('../../../testing/unittest/unittest.dart');
 #import('../../../util/utilslib.dart');
 
 // Ugly, temporary hack: this import disables implicit
 // import of dart:dom by Dartium.
 #import('dart:html', prefix: 'no_use');
 
 #source('CSSStyleDeclarationTests.dart');
 #source('DocumentFragmentTests.dart');
+#source('EventTests.dart');
 
 main() {
   group('CSSStyleDeclaration', testCSSStyleDeclaration);
   group('DocumentFragment', testDocumentFragment);
+  group('Event', testEvents);
 }