fix Polymer to work with latest JS interop

pkg/polymer/lib/src/declaration.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.
 
 part of polymer;
 
 /**
  * **Warning**: this class is experiental and subject to change.
  *
  * The implementation for the `polymer-element` element.
@@ skipping 585 matching lines @@
 
   var shadowCss = platform['ShadowCSS'];
   if (shadowCss == null) return;
 
   // TODO(terry): Remove calls to shimShadowDOMStyling2 and replace with
   //              shimShadowDOMStyling when we support unwrapping dart:html
   //              Element to a JS DOM node.
   var shimShadowDOMStyling2 = shadowCss['shimShadowDOMStyling2'];
   if (shimShadowDOMStyling2 == null) return;
 
-  var scopedCSS = shimShadowDOMStyling2.apply(shadowCss,
-      [style.text, localName]);
+  var scopedCSS = shimShadowDOMStyling2.apply([style.text, localName],
+      thisArg: shadowCss);
 
   // TODO(terry): Remove when shimShadowDOMStyling is called we don't need to
   //              replace original CSS with scoped CSS shimShadowDOMStyling
   //              does that.
   style.text = scopedCSS;
 }
 
 const _STYLE_SELECTOR = 'style';
 const _SHEET_SELECTOR = '[rel=stylesheet]';
 const _STYLE_GLOBAL_SCOPE = 'global';
@@ skipping 13 matching lines @@
   var attr = style.attributes[_STYLE_SCOPE_ATTRIBUTE];
   if (attr != null) {
     clone.attributes[_STYLE_SCOPE_ATTRIBUTE] = attr;
   }
 
   scope.append(clone);
 }
 
 String _cssTextFromSheet(Element sheet) {
   if (sheet == null || js.context == null) return '';
-
-  // TODO(jmesserly): this is a hacky way to communcate with HTMLImports...
-
-  // Remove rel=stylesheet, href to keep this inert.
-  var href = sheet.attributes.remove('href');
-  var rel = sheet.attributes.remove('rel');
-  document.body.append(sheet);
-  String resource;
-  try {
-    resource = js.context['document']['body']['lastChild']['__resource'];
-  } finally {
-    sheet.remove();
-    if (href != null) sheet.attributes['href'] = href;
-    if (rel != null) sheet.attributes['rel'] = rel;
-  }
+  var resource = new JsObject.fromBrowserObject(sheet)['__resource'];
   return resource != null ? resource : '';
 }
 
 const _OBSERVE_SUFFIX = 'Changed';
 
 // TODO(jmesserly): is this list complete?
 final _eventTranslations = const {
   // TODO(jmesserly): these three Polymer.js translations won't work in Dart,
   // because we strip the webkit prefix (below). Reconcile.
   'webkitanimationstart': 'webkitAnimationStart',
@@ skipping 25 matching lines @@
   return map;
 }();
 
 // Dart note: we need this function because we have additional renames JS does
 // not have. The JS renames are simply case differences, whereas we have ones
 // like doubleclick -> dblclick and stripping the webkit prefix.
 String _eventNameFromType(String eventType) {
   final result = _reverseEventTranslations[eventType];
   return result != null ? result : eventType;
 }