Add map to dart:dom collections.

client/dom/frog/dom_frog.dart

 #library('dom');
 
 #native('dom_frog.js');
 // 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.
 
@@ skipping 11981 matching lines @@
  * writing a class that implements [Collection] and the [iterator]
  * method.
  */
 class _Collections {
   static void forEach(Iterable<Object> iterable, void f(Object o)) {
     for (final e in iterable) {
       f(e);
     }
   }
 
+  static List map(Iterable<Object> source,
+                  List<Object> destination,
+                  bool f(o)) {
+    for (final e in source) {
+      destination.add(f(e));
+    }
+    return destination;
+  }
+
   static bool some(Iterable<Object> iterable, bool f(Object o)) {
     for (final e in iterable) {
       if (f(e)) return true;
     }
     return false;
   }
 
   static bool every(Iterable<Object> iterable, bool f(Object o)) {
     for (final e in iterable) {
       if (!f(e)) return false;
@@ skipping 89 matching lines @@
       startIndex = a.length - 1;
     }
     for (int i = startIndex; i >= 0; i--) {
       if (a[i] == element) {
         return i;
       }
     }
     return -1;
   }
 }