[remoting android] Add and build host code.

remoting/host/me2me_desktop_environment.cc

 // Copyright (c) 2012 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/me2me_desktop_environment.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 82 matching lines @@
   bool want_user_interface = false;
 #elif 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().
   bool want_user_interface = getuid() != 0;
-#elif defined(OS_WIN)
+#else
   bool want_user_interface = true;
-#endif  // defined(OS_WIN)
+#endif
 
   // Create the disconnect window.
   if (want_user_interface) {
     // Create the local input monitor.
     local_input_monitor_ = LocalInputMonitor::Create(caller_task_runner(),
                                                      input_task_runner(),
                                                      ui_task_runner(),
                                                      client_session_control);
 
     disconnect_window_ = HostWindow::CreateDisconnectWindow();
@@ skipping 34 matching lines @@
   return std::move(desktop_environment);
 }
 
 void Me2MeDesktopEnvironmentFactory::SetEnableCurtaining(bool enable) {
   DCHECK(caller_task_runner()->BelongsToCurrentThread());
 
   curtain_enabled_ = enable;
 }
 
 }  // namespace remoting