Resubmit: Remove ExtensionService Garbage-Collecting methods.

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>
+
+#include "base/files/file_path.h"
+#include "base/memory/weak_ptr.h"
+
+namespace content {
+class BrowserContext;
+}
+
+class ExtensionService;
+
+namespace extensions {
+
+// The class responsible for cleaning up the cruft left behind on the file
+// system by uninstalled (or failed install) extensions.
+// 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:
+  explicit ExtensionGarbageCollector(ExtensionService* extension_service);
+  ~ExtensionGarbageCollector();
+
+#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();
+
+ private:
+  // 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();
+
+  // Garbage collects apps/extensions isolated storage, if it is not currently
+  // active (i.e. is not in ExtensionRegistry::ENABLED). There is an exception
+  // for ephemeral apps, because they can outlive their cache lifetimes.
+  void GarbageCollectIsolatedStorageIfNeeded();
+
+  // The ExtensionService which owns this GarbageCollector.
+  ExtensionService* extension_service_;
+
+  // The BrowserContext associated with the GarbageCollector, for convenience.
+  // (This is equivalent to extension_service_->GetBrowserContext().)
+  content::BrowserContext* context_;
+
+  // The root extensions installation directory.
+  base::FilePath install_directory_;
+
+#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
+
+  // 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_