Show overview mode button in TouchView with open modal window

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"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/overview/window_selector.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "base/metrics/histogram.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 
 WindowSelectorController::WindowSelectorController() {
 }
 
 WindowSelectorController::~WindowSelectorController() {
 }
 
 // static
+bool WindowSelectorController::IsUserInActiveDesktopEnvironment() {
+  return Shell::GetInstance()->session_state_delegate()->
+             IsActiveUserSessionStarted() &&
+         !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
+         Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
+             user::LOGGED_IN_KIOSK_APP;
+}
+
+// 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() &&
-         !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
-         !Shell::GetInstance()->IsSystemModalWindowOpen() &&
-         Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
-             user::LOGGED_IN_KIOSK_APP;
+  return IsUserInActiveDesktopEnvironment() &&
+         !Shell::GetInstance()->IsSystemModalWindowOpen();
 }
 
 void WindowSelectorController::ToggleOverview() {
   if (IsSelecting()) {
     OnSelectionEnded();
   } else {
     // Don't start overview if window selection is not allowed.
     if (!CanSelect())
       return;
 
@@ skipping 35 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