Some additional Utils functions.

lib/dom/src/native_DOMImplementation.dart

 // 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.
 
 class Utils {
   static List convertToList(List list) {
     // FIXME: [possible optimization]: do not copy the array if Dart_IsArray is fine w/ it.
     final length = list.length;
     List result = new List(length);
     result.copyFrom(list, 0, 0, length);
     return result;
   }
 
+  static List convertMapToList(Map map) {
+    List result = [];
+    map.forEach((k, v) => result.addAll([k, v]));
+    return result;
+  }
+
+  static void populateMap(Map result, List list) {
+    for (int i = 0; i < list.length; i += 2) {
+      result[list[i]] = list[i + 1];
+    }
+  }
+
+  static bool isMap(obj) => obj is Map;
+
+  static Map createMap() => {};
+
   static makeNotImplementedException(String fileName, int lineNo) {
     return new UnsupportedOperationException('[info: $fileName:$lineNo]');
   }
 
   static window() native "Utils_window";
   static print(String message) native "Utils_print";
   static SendPort spawnDomIsolate(Window window, String entryPoint) native "Utils_spawnDomIsolate";
 }
 
 /*
@@ skipping 65 matching lines @@
   void operator []=(String key, String value) native "DOMStringMap_setItem_Callback";
   String putIfAbsent(String key, String ifAbsent()) => Maps.putIfAbsent(this, key, ifAbsent);
   String remove(String key) native "DOMStringMap_remove_Callback";
   void clear() => Maps.clear(this);
   void forEach(void f(String key, String value)) => Maps.forEach(this, f);
   Collection<String> getKeys() native "DOMStringMap_getKeys_Callback";
   Collection<String> getValues() => Maps.getValues(this);
   int get length() => Maps.length(this);
   bool isEmpty() => Maps.isEmpty(this);
 }