Another try at appendHtml and insertAdjacentHtml should be consistently sanitized

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

 // Copyright (c) 2011, 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;
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   factory $CLASSNAME() => document.createDocumentFragment();
 
   factory $CLASSNAME.html(String html,
@@ skipping 75 matching lines @@
    */
   void appendText(String text) {
     this.append(new Text(text));
   }
 
 
   /**
    * Parses the specified text as HTML and adds the resulting node after the
    * last child of this document fragment.
    */
-  void appendHtml(String text) {
-    this.append(new DocumentFragment.html(text));
+  void appendHtml(String text, {NodeValidator validator,
+      NodeTreeSanitizer, treeSanitizer}) {
+    this.append(new DocumentFragment.html(text, validator: validator,
+        treeSanitizer: treeSanitizer));
   }
 
   /** 
    * Alias for [querySelector]. Note this function is deprecated because its
    * semantics will be changing in the future.
    */
   @deprecated
   @Experimental()
   @DomName('DocumentFragment.querySelector')
   Element query(String relativeSelectors) {
     return querySelector(relativeSelectors);
   }
 
   /** 
    * Alias for [querySelectorAll]. Note this function is deprecated because its
    * semantics will be changing in the future.
    */
   @deprecated
   @Experimental()
   @DomName('DocumentFragment.querySelectorAll')
   ElementList<Element> queryAll(String relativeSelectors) {
     return querySelectorAll(relativeSelectors);
   }
 $!MEMBERS
 }