Dart2js support for custom element lifecycle events

pkg/shadow_dom/lib/shadow_dom.debug.js

-if ((!HTMLElement.prototype.createShadowRoot &&
-    !HTMLElement.prototype.webkitCreateShadowRoot) ||
+if ((!HTMLElement.prototype.createShadowRoot) ||
     window.__forceShadowDomPolyfill) {
 
 /*
  * Copyright 2013 The Polymer Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style
  * license that can be found in the LICENSE file.
  */
 (function() {
   // TODO(jmesserly): fix dart:html to use unprefixed name
   if (Element.prototype.webkitCreateShadowRoot) {
@@ skipping 5115 matching lines @@
 
   // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?)
   window.dartExperimentalFixupGetTag = function(originalGetTag) {
     var NodeList = ShadowDOMPolyfill.wrappers.NodeList;
     var ShadowRoot = ShadowDOMPolyfill.wrappers.ShadowRoot;
     var unwrapIfNeeded = ShadowDOMPolyfill.unwrapIfNeeded;
     function getTag(obj) {
       // TODO(jmesserly): do we still need these?
       if (obj instanceof NodeList) return 'NodeList';
       if (obj instanceof ShadowRoot) return 'ShadowRoot';
-      if (obj instanceof MutationRecord) return 'MutationRecord';
-      if (obj instanceof MutationObserver) return 'MutationObserver';
+      if (window.MutationRecord && (obj instanceof MutationRecord))

[blois, 2013/09/20 23:27:36]

Note that I can't get the build tool to run (can't find
"third_party/polymer/ShadowDOM/build.json"), so the minified version is not
updated.

+          return 'MutationRecord';
+      if (window.MutationObserver && (obj instanceof MutationObserver))
+          return 'MutationObserver';
 
       var unwrapped = unwrapIfNeeded(obj);
       if (obj !== unwrapped) {
         // Fix up class names for Firefox.
         // For some of them (like HTMLFormElement and HTMLInputElement),
         // the "constructor" property of the unwrapped nodes points at the
         // same constructor as the wrapper.
         var ctor = obj.constructor
         if (ctor === unwrapped.constructor) {
           var name = ctor._ShadowDOMPolyfill$cacheTag_;
@@ skipping 531 matching lines @@
     for (var i=0, css=[]; i < cssRules.length; i++) {
       css.push(cssRules[i].cssText);
     }
     return css.join('\n\n');
   }
 
   // exports
   scope.ShadowCSS.shimShadowDOMStyling2 = shimShadowDOMStyling2;
 })(window.Platform);
 
-}
+}