Adds code for a new Aura shell.

ui/aura_shell/aura_shell_main.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/aura/desktop.h"
-#include "ui/aura/desktop_host.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_delegate.h"
+#include "ui/aura_shell/desktop_layout_manager.h"
+#include "ui/aura_shell/shell_factory.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/canvas_skia.h"
-#include "ui/gfx/rect.h"
-#include "views/widget/widget.h"
-#include "views/widget/widget_delegate.h"
 
-#if !defined(OS_WIN)
-#include "ui/aura/hit_test.h"
-#endif
+namespace {
+
+void InitDesktopWindow() {
+  aura::Window* desktop_window = aura::Desktop::GetInstance()->window();
+  DesktopLayoutManager* desktop_layout =
+      new DesktopLayoutManager(desktop_window);
+  desktop_window->SetLayoutManager(desktop_layout);
+
+  desktop_layout->set_background_widget(CreateDesktopBackground());
+  desktop_layout->set_launcher_widget(CreateLauncher());
+}
+
+}
 
 int main(int argc, char** argv) {
   CommandLine::Init(argc, argv);
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   ui::RegisterPathProvider();
   icu_util::Initialize();
   ResourceBundle::InitSharedInstance("en-US");
 
 #if defined(USE_X11)
   base::MessagePumpX::DisableGtkMessagePump();
 #endif
 
   // Create the message-loop here before creating the desktop.
   MessageLoop message_loop(MessageLoop::TYPE_UI);
 
+  InitDesktopWindow();
+
   aura::Desktop::GetInstance()->Run();
 
   delete aura::Desktop::GetInstance();
 
   return 0;
 }