arc: Add splash screen for ARC++ Kiosk startup

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

Index: chrome/browser/chromeos/login/ui/login_display_host.h
diff --git a/chrome/browser/chromeos/login/ui/login_display_host.h b/chrome/browser/chromeos/login/ui/login_display_host.h
index 3395498606272b25dcb5977e9255536cc6788130..096523058ef3c79440ec8d9ba506757af55dc7c6 100644
--- a/chrome/browser/chromeos/login/ui/login_display_host.h
+++ b/chrome/browser/chromeos/login/ui/login_display_host.h
@@ -14,6 +14,8 @@
 #include "chrome/browser/chromeos/login/ui/login_display.h"
 #include "ui/gfx/native_widget_types.h"
 
+class AccountId;
+
 namespace chromeos {
 
 class AppLaunchController;
@@ -105,6 +107,9 @@ class LoginDisplayHost {
   // Starts the demo app launch.
   virtual void StartDemoAppLaunch() = 0;
 
+  // Starts ARC kiosk splash screen.
+  virtual void StartArcKiosk(const AccountId& account_id) = 0;
+
  protected:
   // Default LoginDisplayHost. Child class sets the reference.
   static LoginDisplayHost* default_host_;