Added method map to Collection interface and all its implementations (except classes generated fr...

runtime/lib/array.dart

Index: runtime/lib/array.dart
===================================================================
--- runtime/lib/array.dart	(revision 3161)
+++ runtime/lib/array.dart	(working copy)
@@ -84,6 +84,10 @@
     Collections.forEach(this, f);
   }
 
+  Collection map(f(E element)) {
+    return Collections.map(this, new GrowableObjectArray.withCapacity(length), f);
+  }
+
   Collection<E> filter(bool f(E element)) {
     return Collections.filter(this, new GrowableObjectArray<E>(), f);
   }