arc: Add splash screen for ARC++ Kiosk startup

chrome/browser/chromeos/login/ui/login_display_host_impl.h

Index: chrome/browser/chromeos/login/ui/login_display_host_impl.h
diff --git a/chrome/browser/chromeos/login/ui/login_display_host_impl.h b/chrome/browser/chromeos/login/ui/login_display_host_impl.h
index 68cbabed199b5c032e1b0c9619f0f799aba06760..565c76e65e64d25e67e4ee742d0a38eecf2dd8c6 100644
--- a/chrome/browser/chromeos/login/ui/login_display_host_impl.h
+++ b/chrome/browser/chromeos/login/ui/login_display_host_impl.h
@@ -34,10 +34,12 @@
 #include "ui/views/widget/widget_removals_observer.h"
 #include "ui/wm/public/scoped_drag_drop_disabler.h"
 
+class AccountId;
 class ScopedKeepAlive;
 
 namespace chromeos {
 
+class ArcKioskController;
 class DemoAppLauncher;
 class FocusRingController;
 class KeyboardDrivenOobeKeyHandler;
@@ -84,6 +86,7 @@ class LoginDisplayHostImpl : public LoginDisplayHost,
       bool diagnostic_mode,
       bool auto_launch) override;
   void StartDemoAppLaunch() override;
+  void StartArcKiosk(const AccountId& account_id) override;
 
   // Creates WizardController instance.
   WizardController* CreateWizardController();
@@ -217,6 +220,9 @@ class LoginDisplayHostImpl : public LoginDisplayHost,
   // Demo app launcher.
   std::unique_ptr<DemoAppLauncher> demo_app_launcher_;
 
+  // ARC kiosk controller.
+  std::unique_ptr<ArcKioskController> arc_kiosk_controller_;
+
   // Make sure chrome won't exit while we are at login/oobe screen.
   std::unique_ptr<ScopedKeepAlive> keep_alive_;