Mojo: Make the TestService quit when there are no more connections.

mojo/services/test_service/test_service_impl.h

 // 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.
 
-#include "mojo/public/cpp/application/application.h"
+#ifndef MOJO_SERVICES_TEST_SERVICE_TEST_SERVICE_IMPL_H_
+#define MOJO_SERVICES_TEST_SERVICE_TEST_SERVICE_IMPL_H_
+
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/services/test_service/test_service.mojom.h"
 
 namespace mojo {
 namespace test {
 
+class TestServiceApplication;
+
 class TestServiceImpl : public InterfaceImpl<ITestService> {
  public:
-  TestServiceImpl();
+  explicit TestServiceImpl(TestServiceApplication* application);
   virtual ~TestServiceImpl();
 
   // |ITestService| methods:
+  virtual void OnConnectionEstablished() MOJO_OVERRIDE;
+  virtual void OnConnectionError() MOJO_OVERRIDE;
   virtual void Ping(const mojo::Callback<void()>& callback) MOJO_OVERRIDE;
 
  private:
+  TestServiceApplication* const application_;
+
   MOJO_DISALLOW_COPY_AND_ASSIGN(TestServiceImpl);
 };
 
 }  // namespace test
 }  // namespace mojo
 
+#endif  // MOJO_SERVICES_TEST_SERVICE_TEST_SERVICE_IMPL_H_