Revert "Revert "Start of dartium custom element lifecycle event support.""

tools/dom/templates/html/impl/impl_HTMLDocument.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;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
@@ skipping 224 matching lines @@
    * * OutputElement
    * * ParagraphElement
    * * PreElement
    * * ProgressElement
    * * SelectElement
    * * SpanElement
    * * UListElement
    * * VideoElement
    */
 $if DART2JS
-  void register(String tag, Type customElementClass, {String nativeTagName}) {
+  void register(String tag, Type customElementClass, {String extendsTag}) {
     _registerCustomElement(JS('', 'window'), this, tag, customElementClass,
-        nativeTagName);
+        extendsTag);
   }
 $else
-  void register(String tag, Type customElementClass, {String nativeTagName}) {
-    _Utils.register(tag, customElementClass);
+  void register(String tag, Type customElementClass, {String extendsTag}) {
+    _Utils.register(this, tag, customElementClass, extendsTag);
   }
 $endif
 
 $if DART2JS
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
 $endif
   // Note: used to polyfill <template>
   Document _templateContentsOwner;
 
   @DomName('Document.visibilityChange')
@@ skipping 23 matching lines @@
 $endif
   }
 
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.FIREFOX)
   @SupportedBrowser(SupportedBrowser.IE, '10')
   @Experimental()
   Stream<Event> get onVisibilityChange =>
       visibilityChangeEvent.forTarget(this);
 }