Adding Element.created constructor

tools/dom/templates/html/impl/impl_EventTarget.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.
 
 part of $LIBRARYNAME;
 
 /**
  * Base class that supports listening for and dispatching browser events.
  *
  * Normally events are accessed via the Stream getter:
@@ skipping 42 matching lines @@
 
 /**
  * Base class for all browser objects that support events.
  *
  * Use the [on] property to add, and remove events (rather than
  * [$dom_addEventListener] and [$dom_removeEventListener]
  * for compile-time type checks and a more concise API.
  */
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
+  // Custom element created callback.
+  EventTarget._created();
+
   /**
    * This is an ease-of-use accessor for event streams which should only be
    * used when an explicit accessor is not available.
    */
   Events get on => new Events(this);
 $!MEMBERS
 }