This CL contains all of the changes for splitting off all of the native

tools/dom/templates/html/impl/impl_Event.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.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 
+$!TOPLEVEL
+
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   // In JS, canBubble and cancelable are technically required parameters to
   // init*Event. In practice, though, if they aren't provided they simply
   // default to false (since that's Boolean(undefined)).
   //
   // Contrary to JS, we default canBubble and cancelable to true, since that's
   // what people want most of the time anyway.
   factory $CLASSNAME(String type,
       {bool canBubble: true, bool cancelable: true}) {
     return new Event.eventType('Event', type, canBubble: canBubble,
@@ skipping 32 matching lines @@
     var target = this.target;
     var matchedTarget;
     do {
       if (target.matches(_selector)) return target;
       target = target.parent;
     } while (target != null && target != currentTarget.parent);
     throw new StateError('No selector matched for populating matchedTarget.');
   }
 $!MEMBERS
 }