Add "last" setter to List.

third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart

 // Copyright (c) 2013, 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.
 
 part of js.wrapping;
 
 /// Adapter to handle a js array as a dart [List].
 /// You can provide a translator to automatically wrap contained Proxy to some
 /// TypedProxy or something else.
 class JsArrayToListAdapter<E> extends TypedProxy /*with ListMixin<E>*/
@@ skipping 16 matching lines @@
 
   /// Create a new adapter from a proxy of a Js list.
   JsArrayToListAdapter.fromProxy(Proxy proxy, [Translator<E> translator])
       : this._translator = translator,
         super.fromProxy(proxy);
 
   // Iterable
   @override Iterator<E> get iterator => new _JsIterator<E>(this);
   @override int get length => $unsafe.length;
 
-  // Collection
+  // List
+  @override void set last(E value) {
+    if (length == 0) throw new StateError("No element");
+    this[length - 1] = value;
+  }
   @override void add(E value) { $unsafe.push(_toJs(value)); }
   @override void clear() { this.length = 0; }
   @override bool remove(Object element) => removeAt(indexOf(element)) != null;
 
-  // List
   @override E operator [](int index) {
     if (index < 0 || index >= this.length) throw new RangeError.value(index);
     return _fromJs($unsafe[index]);
   }
   @override void operator []=(int index, E value) {
     if (index < 0 || index >= this.length) throw new RangeError.value(index);
     $unsafe[index] = _toJs(value);
   }
   @override void set length(int length) { $unsafe.length = length; }
   @override void sort([int compare(E a, E b)]) {
@@ skipping 496 matching lines @@
   // Iterator
   @override bool moveNext() {
     if (_currentIndex + 1 < length) {
       _currentIndex++;
       return true;
     }
     return false;
   }
   @override E get current => _jsArray[_currentIndex];
 }