Implement a dummy host to do capturing and analysis only.

remoting/host/it2me_desktop_environment.cc

 // Copyright 2013 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/host/it2me_desktop_environment.h"
 
 #include <utility>
 
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "build/build_config.h"
 #include "remoting/host/client_session_control.h"
 #include "remoting/host/host_window.h"
 #include "remoting/host/host_window_proxy.h"
 #include "remoting/host/local_input_monitor.h"
 
 #if defined(OS_POSIX)
@@ skipping 21 matching lines @@
                               supports_touch_events) {
   DCHECK(caller_task_runner->BelongsToCurrentThread());
 
   // Create the local input monitor.
   local_input_monitor_ = LocalInputMonitor::Create(caller_task_runner,
                                                    input_task_runner,
                                                    ui_task_runner,
                                                    client_session_control);
 
   // The host UI should be created on the UI thread.
-  bool want_user_interface = true;
+  bool want_user_interface =
+      !base::CommandLine::ForCurrentProcess()->HasSwitch("disable-it2me-ui");

[joedow, 2016/04/28 22:53:54]

Commented on elsewhere, but it seems odd to use a command line for this if it is
not going to be used on the command line.  I think a member is reasonable (you
might also want to rename it).

[Hzj_jie, 2016/05/03 19:07:05]

Done.

 #if defined(OS_MACOSX)
   // Don't try to display any UI on top of the system's login screen as this
   // is rejected by the Window Server on OS X 10.7.4, and prevents the
   // capturer from working (http://crbug.com/140984).
 
   // TODO(lambroslambrou): Use a better technique of detecting whether we're
   // running in the LoginWindow context, and refactor this into a separate
   // function to be used here and in CurtainMode::ActivateCurtain().
   want_user_interface = getuid() != 0;
 #endif  // defined(OS_MACOSX)
@@ skipping 27 matching lines @@
 std::unique_ptr<DesktopEnvironment> It2MeDesktopEnvironmentFactory::Create(
     base::WeakPtr<ClientSessionControl> client_session_control) {
   DCHECK(caller_task_runner()->BelongsToCurrentThread());
 
   return base::WrapUnique(new It2MeDesktopEnvironment(
       caller_task_runner(), video_capture_task_runner(), input_task_runner(),
       ui_task_runner(), client_session_control, supports_touch_events()));
 }
 
 }  // namespace remoting