Extension syncing: Introduce a NeedsSync pref

chrome/browser/extensions/pending_enables.h

-// Copyright 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_EXTENSIONS_PENDING_ENABLES_H_
-#define CHROME_BROWSER_EXTENSIONS_PENDING_ENABLES_H_
-
-#include <set>
-
-// Included for syncer::ModelType, which is in
-// sync/internal_api/public/base/model_type.h but that is disallowed by
-// chrome/browser/DEPS.
-#include "sync/api/syncable_service.h"
-
-class ExtensionService;
-class ProfileSyncService;
-
-namespace sync_driver {
-class SyncPrefs;
-}
-
-namespace extensions {
-
-class SyncBundle;
-
-// A pending enable is when an app or extension is enabled locally before sync
-// has started. We track these to prevent sync data arriving and clobbering
-// local state, and also to ensure that these early enables get synced to the
-// server when sync does start.
-class PendingEnables {
- public:
-  PendingEnables(scoped_ptr<sync_driver::SyncPrefs> sync_prefs,
-                 SyncBundle* sync_bundle,
-                 syncer::ModelType enable_type);
-  ~PendingEnables();
-
-  // Called when an extension is enabled / disabled locally.
-  // These will check the sync state and figure out whether the change
-  // needs to be remembered for syncing when syncing starts.
-  void Add(const std::string& extension_id);
-  void Remove(const std::string& extension_id);
-
-  // Called when |sync_bundle_| is ready to accept sync changes.
-  // Uses |service| to look up extensions from extension ids.
-  void OnSyncStarted(ExtensionService* service);
-
-  // Whether |extension_id| has a pending enable.
-  bool Contains(const std::string& extension_id) const;
-
- private:
-  bool IsSyncEnabled();
-  bool IsWaitingForSync();
-
-  scoped_ptr<sync_driver::SyncPrefs> sync_prefs_;
-  SyncBundle* sync_bundle_;
-  syncer::ModelType enable_type_;
-  std::set<std::string> ids_;
-
-  bool is_sync_enabled_for_test_;
-
-  DISALLOW_COPY_AND_ASSIGN(PendingEnables);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_PENDING_ENABLES_H_