Add more browser tests for Kiosk update from usb stick.

chrome/browser/chromeos/app_mode/kiosk_app_manager.h

Index: chrome/browser/chromeos/app_mode/kiosk_app_manager.h
diff --git a/chrome/browser/chromeos/app_mode/kiosk_app_manager.h b/chrome/browser/chromeos/app_mode/kiosk_app_manager.h
index b9a3c9bee2607388a24aa58b2109321105c6db47..eca1bcb7831a368cf508f460a99ddb5ecb51cb42 100644
--- a/chrome/browser/chromeos/app_mode/kiosk_app_manager.h
+++ b/chrome/browser/chromeos/app_mode/kiosk_app_manager.h
@@ -186,6 +186,10 @@ class KioskAppManager : public KioskAppDataDelegate,
   // Invoked when kiosk app cache has been updated.
   void OnKioskAppCacheUpdated(const std::string& app_id);
 
+  // Invoked when kiosk app updating from usb stick has been completed.
+  // |success| indicates if all the updates are completed successfully.
+  void OnKioskAppExternalUpdateComplete(bool success);
+
   // Installs the validated external extension into cache.
   void PutValidatedExternalExtension(
       const std::string& app_id,