switch Node.bind to interop

pkg/web_components/lib/platform.concat.js

Index: pkg/web_components/lib/platform.concat.js
diff --git a/pkg/web_components/lib/platform.concat.js b/pkg/web_components/lib/platform.concat.js
index 2044ee351a452fa27b35c88e93128acf2c446804..9481eee0be7c3190376eb21a565fd7d11cdd3646 100644
--- a/pkg/web_components/lib/platform.concat.js
+++ b/pkg/web_components/lib/platform.concat.js
@@ -5440,6 +5440,43 @@ window.ShadowDOMPolyfill = {};
   scope.wrappers.HTMLContentElement = HTMLContentElement;
 })(window.ShadowDOMPolyfill);
 
+/*
+ * Copyright 2014 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(scope) {
+  'use strict';
+
+  var HTMLElement = scope.wrappers.HTMLElement;
+  var mixin = scope.mixin;
+  var registerWrapper = scope.registerWrapper;
+  var wrapHTMLCollection = scope.wrapHTMLCollection;
+  var unwrap = scope.unwrap;
+  var wrap = scope.wrap;
+
+  var OriginalHTMLFormElement = window.HTMLFormElement;
+
+  function HTMLFormElement(node) {
+    HTMLElement.call(this, node);
+  }
+  HTMLFormElement.prototype = Object.create(HTMLElement.prototype);
+  mixin(HTMLFormElement.prototype, {
+    get elements() {
+      // Note: technically this should be an HTMLFormControlsCollection, but
+      // that inherits from HTMLCollection, so should be good enough. Spec:
+      // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection
+      return wrapHTMLCollection(unwrap(this).elements);
+    }
+  });
+
+  registerWrapper(OriginalHTMLFormElement, HTMLFormElement,
+                  document.createElement('form'));
+
+  scope.wrappers.HTMLFormElement = HTMLFormElement;
+})(window.ShadowDOMPolyfill);
+
 // Copyright 2013 The Polymer Authors. All rights reserved.
 // Use of this source code is goverened by a BSD-style
 // license that can be found in the LICENSE file.