Implement a dummy host to do capturing and analysis only.

remoting/test/it2me_standalone_host.h

+// Copyright 2016 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.
+
+#ifndef REMOTING_TEST_IT2ME_STANDALONE_HOST_H_
+#define REMOTING_TEST_IT2ME_STANDALONE_HOST_H_
+
+#include <memory>
+#include <string>
+
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/timer/timer.h"
+#include "remoting/host/host_mock_objects.h"
+#include "remoting/host/it2me_desktop_environment.h"
+#include "remoting/protocol/fake_connection_to_client.h"
+#include "remoting/test/counter_stubs.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace remoting {
+class ChromotingHostContext;
+class ClientSession;
+
+namespace protocol {
+class SessionConfig;
+}  // namespace protocl
+
+namespace test {
+
+// An container for an it2me host by using Counter*Stub(s) to do capturing
+// without needing a client to connect to.
+class It2MeStandaloneHost {
+ public:
+  It2MeStandaloneHost();
+  ~It2MeStandaloneHost();
+
+  // Block current thread forever.
+  void Run();

[joedow, 2016/05/04 16:40:45]

Maybe call this RunHost() or StartHost()?

[Hzj_jie, 2016/05/04 19:18:04]

Considering this class is called a Host, RunHost seems a little bit redundancy.

+
+  void StartToOutputToStdout();

[joedow, 2016/05/04 16:40:45]

Rename to 'StartOutputTimer()' ?

is there ever a case where you want to start the output timer and not the host? 
Maybe this logic should be added to the Run() method...

[Hzj_jie, 2016/05/04 19:18:04]

I believe we may have a chance to start the host, but not output to console :)

+
+ private:
+  // Must run in the same thread as
+  // It2MeDesktopEnvironmentFactory->caller_task_runner()

[joedow, 2016/05/04 16:40:45]

I think you should either use a deterministic method of ensuring the method is
run on the proper thread or remove the comment here.

[Hzj_jie, 2016/05/04 19:18:04]

Seems I put this comment in a wrong position. I have moved it to Run function.

+  void Connect();
+
+  base::MessageLoopForUI message_loop_;
+  base::RunLoop run_loop_;
+  std::unique_ptr<ChromotingHostContext> context_;
+  It2MeDesktopEnvironmentFactory factory_;
+  protocol::FakeConnectionToClient connection_;
+  std::string session_jid_;
+  std::unique_ptr<protocol::SessionConfig> config_;
+  CounterStubs stubs_;
+  testing::NiceMock<MockClientSessionEventHandler> handler_;
+  std::unique_ptr<ClientSession> session_;
+  base::RepeatingTimer timer_;

[joedow, 2016/05/04 16:40:45]

DISALLOW_COPY_AND_ASSIGN(...)

[Hzj_jie, 2016/05/04 19:18:04]

I believe this class does not require to be not copyable or assignable.

+};
+
+}  // namespace test
+}  // namespace remoting
+
+#endif  // REMOTING_TEST_IT2ME_STANDALONE_HOST_H_