Add constructors to all the event classes.

client/touch/EventUtil.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.
 
 /**
  * Common events related helpers.
  */
 class EventUtil {
 
   /**
    * Add an event listener to an element.
    * The event callback is specified by [handler].
    * If [capture] is true, the listener gets events on the capture phase.
    * If [removeHandlerOnFocus] is true the handler is removed when there is any
    * focus event, and added back on blur events.
    */
   static void observe(Element element,
                       EventListenerList listenerList, Function handler,
                       [bool capture = false, bool removeHandlerOnFocus = false]) {
     listenerList.add(handler, capture);
     // TODO(jacobr): this remove on focus behavior seems really ugly.
     if (removeHandlerOnFocus) {
       element.on.focus.add((e) { listenerList.remove(handler, capture); });
       element.on.blur.add((e) { listenerList.add(handler, capture); });
     }
   }
 
-  // TODO(jacobr): add a comment or remove this method.
-  static Event createEvent(String eventType) {
-    Event event = document.createEvent("HTMLEvents");
-    event.initEvent(eventType, true, true);
-    return event;
-  }
-
   /**
    * Clear the keyboard focus of the currently focused element (if there is
    * one). If there is no currently focused element then this function will do
    * nothing. For most browsers this will cause the keyboard to be dismissed.
    */
   static void blurFocusedElement() {
     Element focusedEl = document.query("*:focus");
     if (focusedEl != null) {
       focusedEl.blur();
     }
   }
 }