Support modal windows

chrome/browser/chromeos/login/ui/lock_window_aura.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/lock_window_aura.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/window_animations.h"
 #include "base/command_line.h"
@@ skipping 52 matching lines @@
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.delegate = this;
   params.show_state = ui::SHOW_STATE_FULLSCREEN;
 #if defined(USE_ATHENA)
   // Don't set TRANSLUCENT_WINDOW because we don't have wallpaper manager yet.
   // TODO(dpolukhin): fix this code when crbug.com/408734 fixed.
   athena::ScreenManager::ContainerParams container_params(
       "LoginScreen", athena::CP_LOGIN_SCREEN);
   container_params.can_activate_children = true;
-  container_params.grab_inputs = true;
+  container_params.block_events = true;
+  container_params.modal_container_priority =
+      athena::CP_LOGIN_SCREEN_SYSTEM_MODAL;
   lock_screen_container_.reset(
       athena::ScreenManager::Get()->CreateContainer(container_params));
   params.parent = lock_screen_container_.get();
   lock_screen_container_->SetLayoutManager(
       new athena::FillLayoutManager(lock_screen_container_.get()));
 #else
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   // TODO(oshima): move the lock screen harness to ash.
   params.parent =
       ash::Shell::GetContainer(ash::Shell::GetPrimaryRootWindow(),
                                ash::kShellWindowId_LockScreenContainer);
 #endif
   views::Widget::Init(params);
   wm::SetWindowVisibilityAnimationTransition(
       GetNativeView(), wm::ANIMATE_NONE);
 }
 
 }  // namespace chromeos