Stop the OverviewButton from appearing on the Add-User screen

ash/wm/overview/window_selector_controller.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 "ash/wm/overview/window_selector_controller.h"
 
 #include <vector>
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/root_window_controller.h"
@@ skipping 12 matching lines @@
 WindowSelectorController::WindowSelectorController() {
 }
 
 WindowSelectorController::~WindowSelectorController() {
 }
 
 // static
 bool WindowSelectorController::CanSelect() {
   // Don't allow a window overview if the screen is locked or a modal dialog is
   // open or running in kiosk app session.
-  return Shell::GetInstance()->session_state_delegate()->
-             IsActiveUserSessionStarted() &&
+  return Shell::GetInstance()
+             ->session_state_delegate()
+             ->IsActiveUserSessionStarted() &&
          !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
+         Shell::GetInstance()->session_state_delegate()->GetSessionState() ==
+             SessionStateDelegate::SESSION_STATE_ACTIVE &&
          !Shell::GetInstance()->IsSystemModalWindowOpen() &&
          Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
              user::LOGGED_IN_KIOSK_APP;
 }
 
 void WindowSelectorController::ToggleOverview() {
   if (IsSelecting()) {
     OnSelectionEnded();
   } else {
     // Don't start overview if window selection is not allowed.
@@ skipping 38 matching lines @@
 
 void WindowSelectorController::OnSelectionStarted() {
   if (!last_selection_time_.is_null()) {
     UMA_HISTOGRAM_LONG_TIMES(
         "Ash.WindowSelector.TimeBetweenUse",
         base::Time::Now() - last_selection_time_);
   }
 }
 
 }  // namespace ash