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

client/samples/swarm/DataSource.dart

Index: client/samples/swarm/DataSource.dart
===================================================================
--- client/samples/swarm/DataSource.dart	(revision 3161)
+++ client/samples/swarm/DataSource.dart	(working copy)
@@ -87,6 +87,10 @@
   List<Section> get sections() => _sections;
 
   // Collection<Section> methods:
+  List map(f(Section element)) {
+    return Collections.map(this, new List(), f);
+  }
+
   List<Section> filter(bool f(Section element)) {
     return Collections.filter(this, new List<Section>(), f);
   }