Show overview mode button in TouchView with open modal window

ash/wm/overview/window_selector_controller.cc

Index: ash/wm/overview/window_selector_controller.cc
diff --git a/ash/wm/overview/window_selector_controller.cc b/ash/wm/overview/window_selector_controller.cc
index 73b9c148146c1129afb2de9ddd2c4f98de5ff4cc..4e622177034e20ac6a0722aa66a3ac8d3526d0a1 100644
--- a/ash/wm/overview/window_selector_controller.cc
+++ b/ash/wm/overview/window_selector_controller.cc
@@ -27,17 +27,20 @@ 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.
+bool WindowSelectorController::IsUserInActiveDesktopEnvironment() {
   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;
 }
 
+// static
+bool WindowSelectorController::CanSelect() {
+  return IsUserInActiveDesktopEnvironment() &&
+         !Shell::GetInstance()->IsSystemModalWindowOpen();
+}
+
 void WindowSelectorController::ToggleOverview() {
   if (IsSelecting()) {
     OnSelectionEnded();