Safe DOM w/ fixes

pkg/custom_element/lib/custom_element.dart

 // Copyright (c) 2013, 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.
 
 /**
  * Custom Elements let authors define their own elements. Authors associate code
  * with custom tag names, and then use those custom tag names as they would any
  * standard tag. See <www.polymer-project.org/platform/custom-elements.html>
  * for more information.
  */
@@ skipping 295 matching lines @@
 
   void set innerHTML(String v) {
     host.innerHtml = v;
   }
 
   String get innerHtml => host.innerHtml;
   void set innerHtml(String v) {
     host.innerHtml = v;
   }
 
+  void setInnerHtml(String html,
+    {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
+    host.setInnerHtml(html, validator: validator, treeSanitizer: treeSanitizer);
+  }
+
+  void set unsafeInnerHtml(String html) {
+    host.unsafeInnerHtml = html;
+  }
+
+  DocumentFragment createFragment(String html,
+      {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) =>
+    host.createFragment(html,
+        validator: validator, treeSanitizer: treeSanitizer);
+
   InputMethodContext get inputMethodContext => host.inputMethodContext;
 
   bool get isContentEditable => host.isContentEditable;
 
   String get lang => host.lang;
   set lang(String v) { host.lang = v; }
 
   String get outerHtml => host.outerHtml;
 
   bool get spellcheck => host.spellcheck;
@@ skipping 285 matching lines @@
       for (var removed in record.removedNodes) {
         if (identical(node, removed)) {
           observer.disconnect();
           element.removed();
           return;
         }
       }
     }
   }).observe(element.parentNode, childList: true);
 }