Safely wrap window.top in frog dom.

client/dom/generated/src/frog/Uint8ClampedArray.dart

 
 class _Uint8ClampedArrayJs extends _Uint8ArrayJs implements Uint8ClampedArray, List<int> native "*Uint8ClampedArray" {
 
   factory Uint8ClampedArray(int length) =>  _construct_Uint8ClampedArray(length);
 
   factory Uint8ClampedArray.fromList(List<int> list) => _construct_Uint8ClampedArray(list);
 
   factory Uint8ClampedArray.fromBuffer(ArrayBuffer buffer) => _construct_Uint8ClampedArray(buffer);
 
   static _construct_Uint8ClampedArray(arg) native 'return new Uint8ClampedArray(arg);';
 
   // Use implementation from Uint8Array.
   // final int length;
 
+  void setElements(Object array, [int offset = null]) native '''
+if (offset == null) return this.set(array);
+return this.set(array, offset);''';
+
   _Uint8ClampedArrayJs subarray(int start, [int end = null]) native;
 }