Download and cache kiosk app extension when it is added via kiosk mamangement ui.

chrome/browser/chromeos/app_mode/kiosk_app_data_delegate.h

Index: chrome/browser/chromeos/app_mode/kiosk_app_data_delegate.h
diff --git a/chrome/browser/chromeos/app_mode/kiosk_app_data_delegate.h b/chrome/browser/chromeos/app_mode/kiosk_app_data_delegate.h
index f0a5359757d12c29fdd8969eb79f333de38554fe..51e6a668c293279cfa68e16166381e0ab0444d7f 100644
--- a/chrome/browser/chromeos/app_mode/kiosk_app_data_delegate.h
+++ b/chrome/browser/chromeos/app_mode/kiosk_app_data_delegate.h
@@ -18,6 +18,9 @@ class KioskAppDataDelegate {
   // Invoked to get the root directory for storing cached icon files.
   virtual void GetKioskAppIconCacheDir(base::FilePath* cache_dir) = 0;
 
+  // Invoked to get the root directory for storing cached crx files.
+  virtual void GetKioskAppCrxCacheDir(base::FilePath* cache_dir) = 0;

[xiyuan, 2014/05/02 22:19:45]

This does not belong here since KioskAppData does not handle crx cache. It
should just be a method in KioskAppManager.

[jennyz, 2014/05/02 22:31:01]

Done.

+
   // Invoked when kiosk app data or status has changed.
   virtual void OnKioskAppDataChanged(const std::string& app_id) = 0;