Move DisplayManager and DisplayChangeObserverX11 from aura to ash.

ui/aura/demo/demo_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 "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/client/default_capture_client.h"
 #include "ui/aura/client/stacking_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/test/test_screen.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/events/event.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/compositor/test/compositor_test_support.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/rect.h"
 
@@ skipping 88 matching lines @@
 
   scoped_ptr<aura::client::DefaultCaptureClient> capture_client_;
 
   DISALLOW_COPY_AND_ASSIGN(DemoStackingClient);
 };
 
 int DemoMain() {
   // Create the message-loop here before creating the root window.
   MessageLoop message_loop(MessageLoop::TYPE_UI);
   ui::CompositorTestSupport::Initialize();
-  aura::Env::GetInstance()->SetDisplayManager(new aura::SingleDisplayManager);
+  aura::Env::GetInstance();
+  aura::TestScreen test_screen;
+  gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, &test_screen);
   scoped_ptr<aura::RootWindow> root_window(
-      aura::DisplayManager::CreateRootWindowForPrimaryDisplay());
+      test_screen.CreateRootWindowForPrimaryDisplay());
   scoped_ptr<DemoStackingClient> stacking_client(new DemoStackingClient(
       root_window.get()));
 
   // Create a hierarchy of test windows.
   DemoWindowDelegate window_delegate1(SK_ColorBLUE);
   aura::Window window1(&window_delegate1);
   window1.set_id(1);
   window1.Init(ui::LAYER_TEXTURED);
   window1.SetBounds(gfx::Rect(100, 100, 400, 400));
   window1.Show();
@@ skipping 30 matching lines @@
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   ui::RegisterPathProvider();
   icu_util::Initialize();
   ResourceBundle::InitSharedInstanceWithLocale("en-US", NULL);
 
   return DemoMain();
 }