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

chrome/browser/chromeos/extensions/external_cache.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 26 matching lines @@
 // The ExternalCache manages a cache for external extensions.
 class ExternalCache : public content::NotificationObserver,
                       public extensions::ExtensionDownloaderDelegate {
  public:
   class Delegate {
    public:
     virtual ~Delegate() {}
     // Caller owns |prefs|.
     virtual void OnExtensionListsUpdated(
         const base::DictionaryValue* prefs) = 0;
+    // Called after extension with |id| is loaded in cache.
+    virtual void OnExtensionLoadedInCache(const std::string& id) {}
+    // Called when extension with |id| is failed with downloading for |error|.
+    virtual void OnExtensionDownloadFailed(
+        const std::string& id,
+        extensions::ExtensionDownloaderDelegate::Error error) {}
 
     // Cache needs to provide already installed extensions otherwise they
     // will be removed. Cache calls this function to get version of installed
     // extension or empty string if not installed.
     virtual std::string GetInstalledExtensionVersion(const std::string& id);
   };
 
   // The |request_context| is used for update checks. All file I/O is done via
   // the |backend_task_runner|. If |always_check_updates| is |false|, update
   // checks are performed for extensions that have an |external_update_url|
@@ skipping 46 matching lines @@
 
   // Replace the list of extensions to cache with |prefs| and perform update
   // checks for these.
   void UpdateExtensionsList(scoped_ptr<base::DictionaryValue> prefs);
 
   // If a user of one of the ExternalCache's extensions detects that
   // the extension is damaged then this method can be used to remove it from
   // the cache and retry to download it after a restart.
   void OnDamagedFileDetected(const base::FilePath& path);
 
+  // Removes extensions listed in |ids| from external cache, corresponding crx
+  // files will be removed from disk too.
+  void RemoveExtensions(const std::vector<std::string>& ids);
+
  private:
   // Notifies the that the cache has been updated, providing
   // extensions loader with an updated list of extensions.
   void UpdateExtensionLoader();
 
   // Checks the cache contents and initiate download if needed.
   void CheckCache();
 
   // Invoked on the UI thread when a new entry has been installed in the cache.
   void OnPutExtension(const std::string& id,
@@ skipping 32 matching lines @@
 
   // Weak factory for callbacks.
   base::WeakPtrFactory<ExternalCache> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalCache);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_