Fixed element upgrading for polymer

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 333 matching lines @@
   return null;
 }
 
 
 /******************************************************************************
  **********                                                          **********
  **********                    JS Interop Support                    **********
  **********                                                          **********
  ******************************************************************************/
 
+// List of known tagName to DartClass for custom elements, used for upgrade.
+var _knownCustomeElements = new Map<String, Type>();
+
 Rectangle make_dart_rectangle(r) =>
     r == null ? null : new Rectangle(r['left'], r['top'], r['width'], r['height']);
 
 // Need a default constructor for constructing classes with mixins that are
 // also extending NativeFieldWrapperClass2.  Defining JsoNativeFieldWrapper
 // extending NativeFieldWrapperClass2 creates a default constructor.
 class JsoNativeFieldWrapper extends NativeFieldWrapperClass2 {}
 
 // Flag to disable JS interop asserts.  Setting to false will speed up the
 // wrap_jso calls.
@@ skipping 49 matching lines @@
     var jsTypeName = constructor['name'];
     if (__interop_checks) {
       debug_or_assert("constructor != null && jsTypeName.length > 0", constructor != null && jsTypeName.length > 0);
     }
 
     var dartClass_instance;
     if (jsObject.hasProperty('dart_class')) {
       // Got a dart_class (it's a custom element) use it it's already set up.
       dartClass_instance = jsObject['dart_class'];
     } else {
-      var func = getHtmlCreateFunction(jsTypeName);
-      if (func != null) {
-        dartClass_instance = func();
-        dartClass_instance.blink_jsObject = jsObject;
-        js.setDartHtmlWrapperFor(jsObject, dartClass_instance);
+      var localName = jsObject['localName'];
+      var customElementClass = _knownCustomeElements[localName];
+      // 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 {
+        var func = getHtmlCreateFunction(jsTypeName);
+        if (func != null) {
+          dartClass_instance = func();
+          dartClass_instance.blink_jsObject = jsObject;
+          js.setDartHtmlWrapperFor(jsObject, dartClass_instance);
+        }
       }
     }
     return dartClass_instance;
   } catch(e, stacktrace){
     if (__interop_checks) {
       if (e is DebugAssertException)
         window.console.log("${e.message}\n ${stacktrace}");
       else
         window.console.log("${stacktrace}");
     }
@@ skipping 145 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