Put Kiosk App parameters into device settings.

chrome/browser/chromeos/app_mode/kiosk_app_manager_observer.h

Index: chrome/browser/chromeos/app_mode/kiosk_app_manager_observer.h
diff --git a/chrome/browser/chromeos/app_mode/kiosk_app_manager_observer.h b/chrome/browser/chromeos/app_mode/kiosk_app_manager_observer.h
index 7438150580d4817162b5c31701ef428a3968f55e..fc6369e608a89c2d3b5ce9f566d7fc5e4853369f 100644
--- a/chrome/browser/chromeos/app_mode/kiosk_app_manager_observer.h
+++ b/chrome/browser/chromeos/app_mode/kiosk_app_manager_observer.h
@@ -12,10 +12,13 @@ namespace chromeos {
 class KioskAppManagerObserver {
  public:
   // Invoked when the app data is changed or loading state is changed.
-  virtual void OnKioskAppDataChanged(const std::string& app_id) = 0;
+  virtual void OnKioskAppDataChanged(const std::string& app_id) {}
 
   // Invoked when failed to load web store data of an app.
-  virtual void OnKioskAppDataLoadFailure(const std::string& app_id) = 0;
+  virtual void OnKioskAppDataLoadFailure(const std::string& app_id) {}
+
+  // Invoked when the Kiosk Apps configuration changes.
+  virtual void OnKioskAppsSettingsChanged() {}
 
  protected:
   virtual ~KioskAppManagerObserver() {}