Use @Native annotation on dart2js DOM native classes

tools/dom/templates/html/impl/impl_TouchEvent.darttemplate

 // Copyright (c) 2013, 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.
 
 part of $LIBRARYNAME;
 
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   factory $CLASSNAME(TouchList touches, TouchList targetTouches,
       TouchList changedTouches, String type,
       {Window view, int screenX: 0, int screenY: 0, int clientX: 0,
       int clientY: 0, bool ctrlKey: false, bool altKey: false,
       bool shiftKey: false, bool metaKey: false}) {
     if (view == null) {
       view = window;
     }
     var e = document._createEvent("TouchEvent");
     e._initTouchEvent(touches, targetTouches, changedTouches, type, view,
         screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey);
     return e;
   }
 $!MEMBERS
 
   /**
    * Checks if touch events supported on the current platform.
    *
    * Note that touch events are only supported if the user is using a touch
    * device.
    */
   static bool get supported => Device.isEventTypeSupported('TouchEvent');
 }