Move html events generation to domimpl.

lib/dom/templates/html/dartium/html_dartium.darttemplate

 // Copyright (c) 2012, 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.
 
 // DO NOT EDIT
 // Auto-generated dart:html library.
 
 #library("html");
 
 #import('dart:dom_deprecated', prefix:'dom');
@@ skipping 48 matching lines @@
   if (__document == null) {
     _initialize();
   }
   return __document;
 }
 
 _unwrap(raw) {
   return raw is _DOMTypeBase ? raw._ptr : raw;
 }
 
+unwrap_internal(raw) => _unwrap(raw);
+
 // Warning: does not attempt wrap event listeners.
 _wrap(raw) {
   if (raw is! dom.DOMType) return raw;
   dom.DOMType domObject = raw;
   if (domObject.dartObjectLocalStorage != null)
     return domObject.dartObjectLocalStorage;
   switch(domObject.typeName) {
     case 'HTMLElement':
       return new _UnknownElementImpl._wrap(domObject);
 $WRAPCASES
     case 'HTMLDocument':
       return new _DocumentImpl._wrap(domObject);
     default:
       throw 'Unrecognized object $domObject. Name=${domObject.typeName}';
   }
 }
 
+wrap_internal(raw) => _wrap(raw);
+
 spawnDomIsolate(Window targetWindow, String entryPoint) =>
   dom.spawnDomIsolate(_unwrap(targetWindow), entryPoint);
 
 dom.LayoutTestController get layoutTestController() =>
   dom.layoutTestController;