Add List.shuffle().

sdk/lib/core/list.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.
 
 part of dart.core;
 
 /**
  * An indexable collection of objects with a length.
  *
  * Subclasses of this class implement different kinds of lists.
@@ skipping 147 matching lines @@
    * Sorts this list according to the order specified by the [compare] function.
    *
    * The [compare] function must act as a [Comparator].
    *
    * The default List implementations use [Comparable.compare] if
    * [compare] is omitted.
    */
   void sort([int compare(E a, E b)]);
 
   /**
+   * Shuffles the elements of this list randomly.
+   */
+  void shuffle();
+
+  /**
    * Returns the first index of [element] in this list.
    *
    * Searches the list from index [start] to the length of the list.
    * The first time an object [:o:] is encountered so that [:o == element:],
    * the index of [:o:] is returned.
    * Returns -1 if [element] is not found.
    */
   int indexOf(E element, [int start = 0]);
 
   /**
@@ skipping 188 matching lines @@
 
   /**
    * Returns an unmodifiable [Map] view of `this`.
    *
    * The map uses the indices of this list as keys and the corresponding objects
    * as values. The `Map.keys` [Iterable] iterates the indices of this list
    * in numerical order.
    */
   Map<int, E> asMap();
 }