Add closure_test

tests/compiler/dart2js/inference/send_test.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:io';
 import 'package:async_helper/async_helper.dart';
+import '../equivalence/id_equivalence_helper.dart';
 import 'inference_test_helper.dart';
 
 main() {
   asyncTest(() async {
     Directory dataDir = new Directory.fromUri(Platform.script.resolve('data'));
     await for (FileSystemEntity entity in dataDir.list()) {
       print('Checking ${entity.uri}');
       String annotatedCode = await new File.fromUri(entity.uri).readAsString();
       await checkCode(annotatedCode, checkMemberAstTypeMasks);
     }
   });
 }