Fixed JS custom elements and temporarily mark polymer test as failing

tools/dom/templates/html/dartium/html_dartium.darttemplate

 // Copyright (c) 2012, 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.
 
 // DO NOT EDIT
 // Auto-generated dart:html library.
 
 /**
  * HTML elements and other resources for web-based applications that need to
  * interact with the browser and the DOM (Document Object Model).
@@ skipping 337 matching lines @@
 
 /******************************************************************************
  **********                                                          **********
  **********                    JS Interop Support                    **********
  **********                                                          **********
  ******************************************************************************/
 
 // List of known tagName to DartClass for custom elements, used for upgrade.
 var _knownCustomElements = new Map<String, Type>();
 
+void _addCustomElementType(String tagName, Type dartClass) {
+  _knownCustomElements[tagName] = dartClass;
+}
+
+Type _getCustomElementType(object) => _knownCustomElements[_getCustomElementName(object)];
+
 // Return the tag name or is attribute of the custom element or data binding.
 String _getCustomElementName(element) {
   var jsObject;
   var tag = "";
   var runtimeType = element.runtimeType;
   if (runtimeType == HtmlElement) {
     tag = element.localName;
   } else if (runtimeType == TemplateElement) {
     // Data binding with a Dart class.
     tag = element.attributes['is'];
@@ skipping 55 matching lines @@
       // JS Interop converted the object to a Dart class e.g., Uint8ClampedList.
       // or it's a simple type.
       return jsObject;
     }
 
     var wrapper = js.getDartHtmlWrapperFor(jsObject);
     // if we have a wrapper and and it's an upgraded custom element return the Dart instance.
     if (wrapper != null) {
       if (wrapper.runtimeType == HtmlElement && !wrapper._isBadUpgrade) {
         // We're a Dart instance but we need to upgrade.
-        var tagName = _getCustomElementName(wrapper);
-        var customElementClass = _knownCustomElements[tagName];
+        var customElementClass = _getCustomElementType(wrapper);
         if (customElementClass != null) {
           var dartClass_instance;
           try {
             dartClass_instance = _blink.Blink_Utils.constructElement(customElementClass, jsObject);
           } finally {
             dartClass_instance.blink_jsObject = jsObject;
             jsObject['dart_class'] = dartClass_instance;
             js.setDartHtmlWrapperFor(jsObject, dartClass_instance);
             return dartClass_instance;
           }
@@ skipping 31 matching lines @@
       js.setDartHtmlWrapperFor(jsObject, jsObject);
       return jsObject;
     }
 
     var dartClass_instance;
     if (jsObject.hasProperty('dart_class')) {
       // Got a dart_class (it's a custom element) use it it's already set up
       // make sure it's upgraded.
       dartClass_instance = _upgradeHtmlElement(jsObject['dart_class']);
     } else {
-      var tagName = _getCustomElementName(jsObject);
-      var customElementClass = _knownCustomElements[tagName];
+      var customElementClass = _getCustomElementType(jsObject);
       // Custom Element to upgrade.
       if (jsTypeName == 'HTMLElement' && customElementClass != null) {
         try {
           dartClass_instance = _blink.Blink_Utils.constructElement(customElementClass, jsObject);
         } finally {
           dartClass_instance.blink_jsObject = jsObject;
           jsObject['dart_class'] = dartClass_instance;
           js.setDartHtmlWrapperFor(jsObject, dartClass_instance);
        }
       } else {
         // TODO(terry): Verify with jakemacd that this is right?
         // If we every get an auto-binding we're matching previous non-JS Interop
         // did to return a TemplateElement.
         if (jsTypeName == 'auto-binding') {
           jsTypeName = "HTMLTemplateElement";
         }
 
         var func = getHtmlCreateFunction(jsTypeName);
+        if (func == null) {
+          // One last ditch effort could be a JS custom element.
+          if (jsObject.toString() == "[object HTMLElement]") {
+            func = getHtmlCreateFunction("HTMLElement");
+          }
+        }
         if (func != null) {
           dartClass_instance = func();
           dartClass_instance.blink_jsObject = jsObject;
           js.setDartHtmlWrapperFor(jsObject, dartClass_instance);
         }
       }
     }
     // TODO(jacobr): cache that this is not a dart:html JS class.
     return dartClass_instance;
   } catch(e, stacktrace){
@@ skipping 106 matching lines @@
     return null;
   }
 }
 
 // Upgrade a Dart HtmlElement to the user's Dart custom element class.
 _upgradeHtmlElement(dartInstance) {
   // Only try upgrading HtmlElement (Dart class) if there is a failure then
   // don't try it again - one failure is enough.
   if (dartInstance.runtimeType == HtmlElement && !dartInstance._isBadUpgrade) {
     // Must be exactly HtmlElement not something derived from it.
-    var jsObject = dartInstance.blink_jsObject;
-    var tagName = _getCustomElementName(dartInstance);
-    var customElementClass = _knownCustomElements[tagName];
+
+    var customElementClass = _getCustomElementType(dartInstance);
+
     // Custom Element to upgrade.
     if (customElementClass != null) {
+      var jsObject = dartInstance.blink_jsObject;
       try {
         dartInstance = _blink.Blink_Utils.constructElement(customElementClass, jsObject);
       } catch (e) {
         dartInstance._badUpgrade();
       } finally {
         dartInstance.blink_jsObject = jsObject;
         jsObject['dart_class'] = dartInstance;
         js.setDartHtmlWrapperFor(jsObject, dartInstance);
      }
    }
@@ skipping 107 matching lines @@
 
 unwrap_jso(dartClass_instance) => dartClass_instance;
 wrap_jso(jsObject) => jsObject;
 make_dart_rectangle(r) => r;
 convertDartToNative_Dictionary(Map dict) => dict;
 List convertDartToNative_StringArray(List<String> input) => input;
 convertDartToNative_List(List input) => input;
 createCustomUpgrader(Type customElementClass, $this) => $this;
 
 $endif