[cros Aura] Added modal container for screen lock.

ui/aura_shell/shell.cc

 // Copyright (c) 2011 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 "ui/aura_shell/shell.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "ui/aura/aura_switches.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 65 matching lines @@
   modal_container->set_id(internal::kShellWindowId_ModalContainer);
   containers->push_back(modal_container);
 
   // TODO(beng): Figure out if we can make this use ModalityEventFilter instead
   //             of stops_event_propagation.
   aura::Window* lock_container = new aura::Window(NULL);
   lock_container->set_stops_event_propagation(true);
   lock_container->set_id(internal::kShellWindowId_LockScreenContainer);
   containers->push_back(lock_container);
 
+  aura::Window* lock_modal_container = new aura::Window(NULL);
+  lock_modal_container->SetEventFilter(
+      new ToplevelWindowEventFilter(lock_modal_container));
+  lock_modal_container->SetLayoutManager(
+      new internal::ModalContainerLayoutManager(lock_modal_container));
+  lock_modal_container->set_id(internal::kShellWindowId_LockModalContainer);
+  containers->push_back(lock_modal_container);
+
   aura::Window* status_container = new aura::Window(NULL);
   status_container->set_id(internal::kShellWindowId_StatusContainer);
   containers->push_back(status_container);
 
   aura::Window* menu_container = new aura::Window(NULL);
   menu_container->set_id(internal::kShellWindowId_MenusAndTooltipsContainer);
   containers->push_back(menu_container);
 }
 
 }  // namespace
@@ skipping 151 matching lines @@
       new internal::WorkspaceController(default_container));
   workspace_controller_->SetLauncherModel(launcher_->model());
   default_container->SetEventFilter(
       new internal::DefaultContainerEventFilter(default_container));
   default_container->SetLayoutManager(
       new internal::DefaultContainerLayoutManager(
           workspace_controller_->workspace_manager()));
 }
 
 }  // namespace aura_shell