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..c204f33c721546fbe456c7b7d36640befb2a4b9b 100644
--- a/chrome/browser/chromeos/login/ui/login_display_host.h
+++ b/chrome/browser/chromeos/login/ui/login_display_host.h
@@ -12,6 +12,7 @@
 #include "chrome/browser/chromeos/customization/customization_document.h"
 #include "chrome/browser/chromeos/login/oobe_screen.h"
 #include "chrome/browser/chromeos/login/ui/login_display.h"

[Luis Héctor Chávez, 2017/01/24 18:40:24]

nit: remove and fwd-declare AccountId.

[Sergey Poromov, 2017/01/25 14:29:22]

Done.

+#include "components/signin/core/account_id/account_id.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace chromeos {
@@ -105,6 +106,9 @@ 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_;