More tests now pass and fixed custom elements to only work in default html and svg namespace

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 446 matching lines @@
 ///  libraries.
 class DartHtmlDomObject {
 
   /// The underlying JS DOM object.
   js.JsObject blink_jsObject;
 
 }
 
 // Flag to disable JS interop asserts.  Setting to false will speed up the
 // wrap_jso calls.
-bool __interop_checks = true;
+bool __interop_checks = false;
 
 /** Expando for JsObject, used by every Dart class associated with a Javascript
  *  class (e.g., DOM, WebAudio, etc.).
  */
 
 /**
  * Return the JsObject associated with a Dart class [dartClass_instance].
  */
 unwrap_jso(dartClass_instance) => js.unwrap_jso(dartClass_instance);
 
@@ skipping 64 matching lines @@
     var dartClass_instance;
     var customElementClass = null;
     var extendsTag = "";
     var custom = _getCustomElementEntry(jsObject);
     if (custom != null) {
       customElementClass = custom['type'];
       extendsTag = custom['extends'];
     }
 
     // Custom Element to upgrade.
-    if (customElementClass != null && extendsTag == "") {
+    // Only allow custome elements to be created in the html or svg default
+    // namespace.
+    var defaultNS = jsObject['namespaceURI'] == 'http://www.w3.org/1999/xhtml' ||
+        jsObject['namespaceURI'] ==  'http://www.w3.org/2000/svg';
+    if (customElementClass != null && extendsTag == "" && defaultNS) {
       try {
         dartClass_instance = _blink.Blink_Utils.constructElement(customElementClass, jsObject);
       } finally {
         dartClass_instance.blink_jsObject = jsObject;
         js.setDartHtmlWrapperFor(jsObject, dartClass_instance);
      }
     } else {
       var func = getHtmlCreateFunction(jsTypeName);
       if (func == null) {
         if (jsTypeName == 'auto-binding') {
@@ skipping 254 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