Modal window in user session not blocks user adding screen.

ash/root_window_controller.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 "ash/root_window_controller.h"
 
 #include <vector>
 
 #include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
@@ skipping 240 matching lines @@
 RootWindowController::GetSystemModalLayoutManager(aura::Window* window) {
   aura::Window* container = NULL;
   if (window) {
     if (window->parent() &&
         window->parent()->id() >= kShellWindowId_LockScreenContainer) {
       container = GetContainer(kShellWindowId_LockSystemModalContainer);
     } else {
       container = GetContainer(kShellWindowId_SystemModalContainer);
     }
   } else {
-    user::LoginStatus login = Shell::GetInstance()->system_tray_delegate() ?
-        Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() :
-        user::LOGGED_IN_NONE;
-    int modal_window_id = (login == user::LOGGED_IN_LOCKED ||
-                           login == user::LOGGED_IN_NONE) ?
-        kShellWindowId_LockSystemModalContainer :
-        kShellWindowId_SystemModalContainer;
+    int modal_window_id = Shell::GetInstance()->session_state_delegate()
+        ->IsUserSessionBlocked() ? kShellWindowId_LockSystemModalContainer :
+                                   kShellWindowId_SystemModalContainer;
     container = GetContainer(modal_window_id);
   }
   return container ? static_cast<SystemModalContainerLayoutManager*>(
       container->layout_manager()) : NULL;
 }
 
 aura::Window* RootWindowController::GetContainer(int container_id) {
   return root_window_->GetChildById(container_id);
 }
 
@@ skipping 447 matching lines @@
 
 void RootWindowController::OnTouchHudProjectionToggled(bool enabled) {
   if (enabled)
     EnableTouchHudProjection();
   else
     DisableTouchHudProjection();
 }
 
 }  // namespace internal
 }  // namespace ash