Add stubs to frog to keep dartc happy

lib/dom/frog/dom_frog.dart

 #library('dom');
 
 // Copyright (c) 2011, 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 DOM library.
 
 
 
 
 // TODO(sra): What 'window' do we get in a worker?  Perhaps this
 // should return the interface type.
 DOMWindow get window() native "return window;";
 
 HTMLDocument get document() native "return document;";
 
+// TODO(vsm): Implement these.
+interface LayoutTestController {}
+LayoutTestController layoutTestController;
+
+spawnDomIsolate(Window targetWindow, String entryPoint) {
+  throw const NotImplementedException();
+}
+
 class _AbstractWorkerJs extends _EventTargetJs implements AbstractWorker native "*AbstractWorker" {
 
   void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
   bool dispatchEvent(_EventJs evt) native;
 
   void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 }
 
 class _ArrayBufferJs extends _DOMTypeJs implements ArrayBuffer native "*ArrayBuffer" {
@@ skipping 25203 matching lines @@
     if (length < 0) throw new IllegalArgumentException('length');
     if (start < 0) throw new IndexOutOfRangeException(start);
     int end = start + length;
     if (end > a.length) throw new IndexOutOfRangeException(end);
     for (int i = start; i < end; i++) {
       accumulator.add(a[i]);
     }
     return accumulator;
   }
 }