Add a hack to allow us to disable extension garbage collection.

chrome/browser/extensions/extension_service.h

 // Copyright (c) 2012 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_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 677 matching lines @@
   }
 
   // Adds/Removes update observers.
   void AddUpdateObserver(extensions::UpdateObserver* observer);
   void RemoveUpdateObserver(extensions::UpdateObserver* observer);
 
   // |flare| provides a StartSyncFlare to the SyncableService. See
   // sync_start_util for more.
   void SetSyncStartFlare(const syncer::SyncableService::StartSyncFlare& flare);
 
+#if defined(OS_CHROMEOS)
+  void disable_garbage_collection() {
+    disable_garbage_collection_ = true;
+  }
+  void enable_garbage_collection() {
+    disable_garbage_collection_ = false;
+  }
+#endif
+
  private:
   // Contains Extension data that can change during the life of the process,
   // but does not persist across restarts.
   struct ExtensionRuntimeData {
     // True if the background page is ready.
     bool background_page_ready;
 
     // True while the extension is being upgraded.
     bool being_upgraded;
 
@@ skipping 245 matching lines @@
   scoped_ptr<extensions::ManagementPolicy::Provider>
       shared_module_policy_provider_;
 
   ObserverList<extensions::UpdateObserver, true> update_observers_;
 
   // Run()ning tells sync to try and start soon, because syncable changes
   // have started happening. It will cause sync to call us back
   // asynchronously via MergeDataAndStartSyncing as soon as possible.
   syncer::SyncableService::StartSyncFlare flare_;
 
+#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
+
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_