Add utility print method.

client/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 makeNotImplementedException() {
     return const NotImplementedException();
   }
 
-  static window() native "TopLevel_Window";
-
+  static window() native "Utils_window";
+  static print(String message) native "Utils_print";
   static SendPort spawnDomIsolate(Window window, String entryPoint) native "Utils_spawnDomIsolate";
 }
 
 /*
  * [NPObjectBase] is native wrapper class injected from embedder's code.
  */
 class NPObject extends DOMWrapperBase {
   static NPObject retrieve(String key) native "NPObject_retrieve";
   property(String propertyName) native "NPObject_property";
   invoke(String methodName, [ObjectArray args = null]) native "NPObject_invoke";
@@ skipping 41 matching lines @@
 class LocationCrossFrameImplementation extends DOMWrapperBase implements Location {
   // Fields.
   void set href(String) native "Location_href_Setter";
 
   // Implementation support.
   static LocationCrossFrameImplementation _createLocationCrossFrameImplementation() => new LocationCrossFrameImplementation._createLocationCrossFrameImplementation();
   LocationCrossFrameImplementation._createLocationCrossFrameImplementation();
 
   String get typeName() => "Location";
 }