Add constructors to all the event classes.

client/html/src/TouchEvent.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.
 
-// WARNING: Do not edit - generated code.
+interface TouchEvent extends UIEvent factory TouchEventWrappingImplementation {
 
-interface TouchEvent extends UIEvent {
+  TouchEvent(TouchList touches, TouchList targetTouches,
+      TouchList changedTouches, String type, Window view, int screenX,
+      int screenY, int clientX, int clientY, [bool ctrlKey, bool altKey,
+      bool shiftKey, bool metaKey]);
 
   bool get altKey();
 
   TouchList get changedTouches();
 
   bool get ctrlKey();
 
   bool get metaKey();
 
   bool get shiftKey();
 
   TouchList get targetTouches();
 
   TouchList get touches();
-
-  void initTouchEvent(TouchList touches, TouchList targetTouches, TouchList changedTouches, String type, Window view, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);
 }