Add constructors to all the event classes.

client/html/src/TouchEventWrappingImplementation.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.
-
 class TouchEventWrappingImplementation extends UIEventWrappingImplementation implements TouchEvent {
   TouchEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
+  TouchEvent(TouchList touches, TouchList targetTouches,
+      TouchList changedTouches, String type, Window view, int screenX,
+      int screenY, int clientX, int clientY, [bool ctrlKey = false,
+      bool altKey = false, bool shiftKey = false, bool metaKey = false]) {
+    var e = dom.document.createEvent("TouchEvent");
+    e.initTouchEvent(LevelDom.unwrap(touches), LevelDom.unwrap(targetTouches),
+        LevelDom.unwrap(changedTouches), type, LevelDom.unwrap(view), screenX,
+        screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey);
+    return LevelDom.wrapTouchEvent(e);
+  }
+
   bool get altKey() { return _ptr.altKey; }
 
   TouchList get changedTouches() { return LevelDom.wrapTouchList(_ptr.changedTouches); }
 
   bool get ctrlKey() { return _ptr.ctrlKey; }
 
   bool get metaKey() { return _ptr.metaKey; }
 
   bool get shiftKey() { return _ptr.shiftKey; }
 
   TouchList get targetTouches() { return LevelDom.wrapTouchList(_ptr.targetTouches); }
 
   TouchList get touches() { return LevelDom.wrapTouchList(_ptr.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) {
-    _ptr.initTouchEvent(LevelDom.unwrap(touches), LevelDom.unwrap(targetTouches), LevelDom.unwrap(changedTouches), type, LevelDom.unwrap(view), screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey);
-    return;
-  }
 }