Makes Ctrl-Shift-L work in AppList

ash/shell/shell_main.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/launcher/launcher_types.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_factory.h"
 #include "ash/shell_window_ids.h"
 #include "ash/shell/example_factory.h"
@@ skipping 40 matching lines @@
     ash::shell::ToplevelWindow::CreateParams create_params;
     create_params.can_resize = true;
     create_params.can_maximize = true;
     ash::shell::ToplevelWindow::CreateToplevelWindow(create_params);
   }
 
   virtual views::Widget* CreateStatusArea() OVERRIDE {
     return ash::internal::CreateStatusArea();
   }
 
+#if defined(CHROME_OS)
+ virtual void LockScreen() OVERRIDE {
+   ash::shell::CreateLockScreen();
+ }
+#endif
+
   virtual void BuildAppListModel(ash::AppListModel* model) OVERRIDE {
     ash::shell::BuildAppListModel(model);
   }
 
   virtual ash::AppListViewDelegate* CreateAppListViewDelegate() OVERRIDE {
     return ash::shell::CreateAppListViewDelegate();
   }
 
   std::vector<aura::Window*> GetCycleWindowList(
       CycleSource source,
@@ skipping 62 matching lines @@
   aura::RootWindow::GetInstance()->Run();
 
   ash::Shell::DeleteInstance();
 
   aura::RootWindow::DeleteInstance();
 
   ui::CompositorTestSupport::Terminate();
 
   return 0;
 }