Implement a dummy host to do capturing and analysis only.

remoting/test/it2me_standalone_host.cc

+// 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.
+
+#include "remoting/test/it2me_standalone_host.h"
+
+#include <vector>
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/memory/ptr_util.h"
+#include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "remoting/base/auto_thread_task_runner.h"
+#include "remoting/host/chromoting_host_context.h"
+#include "remoting/host/host_extension.h"
+#include "remoting/protocol/pairing_registry.h"
+#include "remoting/protocol/protocol_mock_objects.h"
+#include "remoting/protocol/session_config.h"
+
+namespace remoting {
+namespace test {
+
+using ::remoting::protocol::MockSession;
+
+It2MeStandaloneHost::It2MeStandaloneHost()
+  : message_loop_(),

[joedow, 2016/05/03 22:28:30]

Do these need to be included?  I thought default init came for free

[Hzj_jie, 2016/05/04 02:11:57]

Done.

+    run_loop_(),
+    context_(ChromotingHostContext::Create(
+        new AutoThreadTaskRunner(
+        message_loop_.task_runner(), run_loop_.QuitClosure()))),
+    factory_(context_->file_task_runner(),
+             context_->video_capture_task_runner(),
+             context_->input_task_runner(),
+             context_->ui_task_runner()),
+    connection_(base::WrapUnique(new testing::NiceMock<MockSession>())),
+    session_jid_("user@domain/rest-of-jid"),
+#if defined(OS_LINUX)
+    // We cannot support audio capturing for linux, since a pipe name is
+    // needed to initialize AudioCapturerLinux.
+    config_(protocol::SessionConfig::ForTest()),
+#else
+    config_(protocol::SessionConfig::ForTestWithAudio()),
+#endif
+    audio_stub_(),

[joedow, 2016/05/03 22:28:29]

You don't need to include these in the initializer list do you?  I thought the
default c'tor was already called for you by the time you hit the opening curly
braces below

[Hzj_jie, 2016/05/04 02:11:56]

Done.

+    client_stub_(),
+    host_stub_(),
+    video_stub_(&connection_),
+    handler_(),
+    session_() {
+  factory_.enable_user_interface(false);
+  EXPECT_CALL(*static_cast<MockSession*>(connection_.session()), jid())
+      .WillRepeatedly(testing::ReturnRef(session_jid_));
+  EXPECT_CALL(*static_cast<MockSession*>(connection_.session()), config())
+      .WillRepeatedly(testing::ReturnRef(*config_));
+  connection_.set_audio_stub(&audio_stub_);
+  connection_.set_video_stub(&video_stub_);
+  connection_.set_client_stub(&client_stub_);
+  connection_.set_host_stub(&host_stub_);
+  connection_.set_video_encode_task_runner(
+      context_->video_encode_task_runner());
+}
+
+void It2MeStandaloneHost::ConnectProxy(It2MeStandaloneHost* host) {
+  host->Connect();
+}
+
+void It2MeStandaloneHost::Connect() {
+  session_.reset(new ClientSession(
+      &handler_,
+      context_->audio_task_runner(),
+      std::unique_ptr<protocol::ConnectionToClient>(&connection_),
+      &factory_,
+      base::TimeDelta(),
+      scoped_refptr<protocol::PairingRegistry>(),
+      std::vector<HostExtension*>()));
+  session_->OnConnectionAuthenticated(&connection_);
+  session_->OnConnectionChannelsConnected(&connection_);
+  session_->CreateVideoStreams(&connection_);
+}
+
+void It2MeStandaloneHost::Run() {

[joedow, 2016/05/03 22:28:30]

I'd move this file above the private methods in this file.  I think it is nice
when the methods in the cc file are roughly in the same order as the header.

[Hzj_jie, 2016/05/04 02:11:56]

Done.

+  context_->file_task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&It2MeStandaloneHost::ConnectProxy, this));

[joedow, 2016/05/03 22:28:30]

This method doesn't need to be static.  Instead of the work you are doing here
you could do:
PostTask(&It2MeStandaloneHost::Connect, base::Unretained(this));  You shouldn't
need to implement RefCounted as long as you can verify that your instance will
not be destroyed before the task_runner.

[Hzj_jie, 2016/05/04 02:11:57]

Done.

+  run_loop_.Run();
+}
+
+It2MeStandaloneHost::~It2MeStandaloneHost() {}

[joedow, 2016/05/03 22:28:30]

d'tor should go below the c'tor

[Hzj_jie, 2016/05/04 02:11:56]

Done.

+
+}  // namespace test
+}  // namespace remoting