Create an apptesting framework for dart.

services/dart/dart_apptests/main.dart

Index: services/dart/dart_apptests/main.dart
diff --git a/services/dart/dart_apptests/main.dart b/services/dart/dart_apptests/main.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c193530499aaa1191d82f2541cdbd053ab04ab94
--- /dev/null
+++ b/services/dart/dart_apptests/main.dart
@@ -0,0 +1,13 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:apptest/apptest.dart';
+import 'package:services/dart/test/echo_service.mojom.dart';
+
+import 'echo_apptests.dart';
+import 'pingpong_apptests.dart';
+
+main(List args) {
+  runAppTests(args[0], [echoApptests, pingpongApptests]);
+}