Create an apptesting framework for dart.

mojo/public/dart/src/application.dart

 // Copyright 2014 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.
 
 part of application;
 
 class _ApplicationImpl implements application_mojom.Application {
   application_mojom.ApplicationStub _stub;
   shell_mojom.ShellProxy shell;
   Application _application;
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     });
   }
 
   void close() {
     assert(_applicationImpl != null);
     _applicationConnections.forEach((c) => c.close());
     _applicationConnections.clear();
     _applicationImpl.close();
   }
 
+  // This method closes all the application connections. Used during apptesting.
+  resetConnections() {
+    assert(_applicationImpl != null);
+    _applicationConnections.forEach((c) => c.close());
+    _applicationConnections.clear();
+  }
+
   void _acceptConnection(String requestorUrl, ServiceProviderStub services,
       ServiceProviderProxy exposedServices, String resolvedUrl) {
     var connection = new ApplicationConnection(services, exposedServices);
     _applicationConnections.add(connection);
     acceptConnection(requestorUrl, resolvedUrl, connection);
   }
 
   // Override this method to provide services on |connection|.
   // If you provide at least one service or set fallbackServiceProvider,
   // then you must invoke connection.listen().
   void acceptConnection(String requestorUrl, String resolvedUrl,
       ApplicationConnection connection) {
   }
 }