Implement a dummy host to do capturing and analysis only.

remoting/host/it2me_desktop_environment.cc

Index: remoting/host/it2me_desktop_environment.cc
diff --git a/remoting/host/it2me_desktop_environment.cc b/remoting/host/it2me_desktop_environment.cc
index ffe768f02cd1b604ef06ccc067defa3fe1fdfe9e..7ffc79deda0887358cd0d6d06cddd4c508f77630 100644
--- a/remoting/host/it2me_desktop_environment.cc
+++ b/remoting/host/it2me_desktop_environment.cc
@@ -32,7 +32,8 @@ It2MeDesktopEnvironment::It2MeDesktopEnvironment(
     scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
     base::WeakPtr<ClientSessionControl> client_session_control,
-    bool supports_touch_events)
+    bool supports_touch_events,
+    bool enable_user_interface)
     : BasicDesktopEnvironment(caller_task_runner,
                               video_capture_task_runner,
                               input_task_runner,
@@ -47,7 +48,6 @@ It2MeDesktopEnvironment::It2MeDesktopEnvironment(
                                                    client_session_control);
 
   // The host UI should be created on the UI thread.
-  bool want_user_interface = true;
 #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
@@ -56,11 +56,11 @@ It2MeDesktopEnvironment::It2MeDesktopEnvironment(
   // 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;
+  enable_user_interface = getuid() != 0;
 #endif  // defined(OS_MACOSX)
 
   // Create the continue and disconnect windows.
-  if (want_user_interface) {
+  if (enable_user_interface) {
     continue_window_ = HostWindow::CreateContinueWindow();
     continue_window_.reset(new HostWindowProxy(
         caller_task_runner, ui_task_runner, std::move(continue_window_)));
@@ -91,7 +91,8 @@ std::unique_ptr<DesktopEnvironment> It2MeDesktopEnvironmentFactory::Create(
 
   return base::WrapUnique(new It2MeDesktopEnvironment(
       caller_task_runner(), video_capture_task_runner(), input_task_runner(),
-      ui_task_runner(), client_session_control, supports_touch_events()));
+      ui_task_runner(), client_session_control, supports_touch_events(),
+      enable_user_interface_));
 }
 
 }  // namespace remoting