Add garbage collection for shared extensions on Chrome OS

chrome/browser/extensions/extension_garbage_collector.h

 // Copyright 2014 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_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
 
 #include <map>
 #include <string>
 
@@ skipping 13 matching lines @@
 // The class is owned by ExtensionService, but is mostly independent. Tasks to
 // garbage collect extensions and isolated storage are posted once the
 // ExtensionSystem signals ready.
 class ExtensionGarbageCollector : public KeyedService, public InstallObserver {
  public:
   explicit ExtensionGarbageCollector(content::BrowserContext* context);
   virtual ~ExtensionGarbageCollector();
 
   static ExtensionGarbageCollector* Get(content::BrowserContext* context);
 
-#if defined(OS_CHROMEOS)
-  // Enable or disable garbage collection. See |disable_garbage_collection_|.
-  void disable_garbage_collection() { disable_garbage_collection_ = true; }
-  void enable_garbage_collection() { disable_garbage_collection_ = false; }
-#endif
-
   // Manually trigger GarbageCollectExtensions() for testing.
   void GarbageCollectExtensionsForTest();
 
   // Overriddes for KeyedService:
   virtual void Shutdown() OVERRIDE;
 
   // Overriddes for InstallObserver
   virtual void OnBeginCrxInstall(const std::string& extension_id) OVERRIDE;
   virtual void OnFinishCrxInstall(const std::string& extension_id,
                                   bool success) OVERRIDE;
 
- private:
+ protected:
   // Cleans up the extension install directory. It can end up with garbage in it
   // if extensions can't initially be removed when they are uninstalled (eg if a
   // file is in use).
   // Obsolete version directories are removed, as are directories that aren't
   // found in the ExtensionPrefs.
   // The "Temp" directory that is used during extension installation will get
   // removed iff there are no pending installations.
-  void GarbageCollectExtensions();
+  virtual void GarbageCollectExtensions();
 
   // Garbage collects apps/extensions isolated storage if it is uninstalled.
   // There is an exception for ephemeral apps because they can outlive their
   // cache lifetimes.
   void GarbageCollectIsolatedStorageIfNeeded();
 
+  static void GarbageCollectExtensionsOnFileThread(
+      const base::FilePath& install_directory,
+      const std::multimap<std::string, base::FilePath>& extension_paths);
+
   // The BrowserContext associated with the GarbageCollector.
   content::BrowserContext* context_;
 
-#if defined(OS_CHROMEOS)
-  // TODO(rkc): HACK alert - this is only in place to allow the
-  // kiosk_mode_screensaver to prevent its extension from getting garbage
-  // collected. Remove this once KioskModeScreensaver is removed.
-  // See crbug.com/280363
-  bool disable_garbage_collection_;
-#endif
-
   // The number of currently ongoing CRX installations. This is used to prevent
   // garbage collection from running while a CRX is being installed.
   int crx_installs_in_progress_;
 
   // Generate weak pointers for safely posting to the file thread for garbage
   // collection.
   base::WeakPtrFactory<ExtensionGarbageCollector> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionGarbageCollector);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_