Support modal windows

chrome/browser/chromeos/login/ui/login_display_host_impl.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 "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
 
 #include <vector>
 
 #include "ash/audio/sounds.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 1045 matching lines @@
 
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.bounds = background_bounds();
   params.show_state = ui::SHOW_STATE_FULLSCREEN;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 #if defined(USE_ATHENA)
   athena::ScreenManager::ContainerParams container_params(
       "LoginScreen", athena::CP_LOGIN_SCREEN);
   container_params.can_activate_children = true;
+  container_params.block_events = true;
+  container_params.modal_container_priority =
+      athena::CP_LOGIN_SCREEN_SYSTEM_MODAL;
   login_screen_container_.reset(
       athena::ScreenManager::Get()->CreateContainer(container_params));
   params.parent = login_screen_container_.get();
   login_screen_container_->SetLayoutManager(
       new athena::FillLayoutManager(login_screen_container_.get()));
 #else
   params.parent =
       ash::Shell::GetContainer(ash::Shell::GetPrimaryRootWindow(),
                                ash::kShellWindowId_LockScreenContainer);
 #endif
@@ skipping 219 matching lines @@
   scoped_ptr<locale_util::SwitchLanguageCallback> callback(
       new locale_util::SwitchLanguageCallback(
           base::Bind(&OnLanguageSwitchedCallback, base::Passed(data.Pass()))));
 
   // Load locale keyboards here. Hardware layout would be automatically enabled.
   locale_util::SwitchLanguage(
       locale, true, true /* login_layouts_only */, callback.Pass());
 }
 
 }  // namespace chromeos