Work in progres, please take a look and give early feedback if this is the way we want to structure…

tests/service_tests/performance/dart/performance_service.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 // Generated file. Do not edit.
 
 library performance_service;
 
 import "dart:ffi";
 import "dart:service" as service;
 import "package:service/struct.dart";
 
 final Channel _channel = new Channel();
 final Port _port = new Port(_channel);
-final Foreign _postResult = Foreign.lookup("PostResultToService");
+final ForeignFunction _postResult =
+    ForeignLibrary.main.lookup("PostResultToService");
 
 bool _terminated = false;
 PerformanceService _impl;
 
 abstract class PerformanceService {
   int echo(int n);
   int countTreeNodes(TreeNode node);
   void buildTree(int n, TreeNodeBuilder result);
 
   static void initialize(PerformanceService impl) {
@@ skipping 56 matching lines @@
   }
 }
 
 class _TreeNodeList extends ListReader implements List<TreeNode> {
   TreeNode operator[](int index) => readListElement(new TreeNode(), index, 8);
 }
 
 class _TreeNodeBuilderList extends ListBuilder implements List<TreeNodeBuilder> {
   TreeNodeBuilder operator[](int index) => readListElement(new TreeNodeBuilder(), index, 8);
 }