Safely wrap window.top in frog dom.

client/dom/generated/src/interface/Uint8ClampedArray.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.
 
 // WARNING: Do not edit - generated code.
 
 interface Uint8ClampedArray extends Uint8Array default _TypedArrayFactoryProvider {
 
   Uint8ClampedArray(int length);
 
   Uint8ClampedArray.fromList(List<int> list);
 
   Uint8ClampedArray.fromBuffer(ArrayBuffer buffer);
 
   final int length;
 
+  void setElements(Object array, [int offset]);
+
   Uint8ClampedArray subarray(int start, [int end]);
 }