Tray elements behave appropriately on the multiple signin screen (more like lock screen)

ash/system/chromeos/session/logout_button_tray.cc

 // Copyright 2014 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 "ash/system/chromeos/session/logout_button_tray.h"
 
+#include "ash/session/session_state_delegate.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shell.h"
 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_utils.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 133 matching lines @@
     user::LoginStatus login_status) {
   login_status_ = login_status;
   const base::string16 title =
       GetLocalizedSignOutStringForStatus(login_status, false);
   button_->SetText(title);
   button_->SetAccessibleName(title);
   UpdateVisibility();
 }
 
 void LogoutButtonTray::UpdateVisibility() {
-  SetVisible(show_logout_button_in_tray_ &&
-             login_status_ != user::LOGGED_IN_NONE &&
-             login_status_ != user::LOGGED_IN_LOCKED);
+  SetVisible(
+      show_logout_button_in_tray_ && login_status_ != user::LOGGED_IN_NONE &&
+      login_status_ != user::LOGGED_IN_LOCKED &&
+      ash::Shell::GetInstance()->session_state_delegate()->GetSessionState() !=
+          ash::SessionStateDelegate::SESSION_STATE_LOGIN_SECONDARY);
 }
 
 }  // namespace ash