WIP: Pref service: use the incognito support from Chrome

components/sync_preferences/pref_service_syncable_factory.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 COMPONENTS_SYNC_PREFERENCES_PREF_SERVICE_SYNCABLE_FACTORY_H_
 #define COMPONENTS_SYNC_PREFERENCES_PREF_SERVICE_SYNCABLE_FACTORY_H_
 
 #include <memory>
+#include <set>
 
 #include "base/macros.h"
 #include "components/prefs/pref_service_factory.h"
+#include "components/prefs/pref_value_store.h"
 
 namespace policy {
 class BrowserPolicyConnector;
 class PolicyService;
 }
 
 namespace service_manager {
 class Connector;
 }
 
@@ skipping 23 matching lines @@
 
   void SetPrefModelAssociatorClient(
       PrefModelAssociatorClient* pref_model_associator_client);
 
   // |connector| might be null during test or if we're not using the Mojo pref
   // |service.
   std::unique_ptr<PrefServiceSyncable> CreateSyncable(
       user_prefs::PrefRegistrySyncable* registry,
       service_manager::Connector* connector = nullptr);
 
+  std::unique_ptr<PrefServiceSyncable> CreateIncognitoSyncable(
+      user_prefs::PrefRegistrySyncable* pref_registry,
+      PrefStore* incognito_extension_pref_store,
+      const std::vector<const char*>& overlay_pref_names,
+      std::set<PrefValueStore::PrefStoreType> already_connected_types,
+      service_manager::Connector* incognito_connector,
+      service_manager::Connector* user_connector);
+
  private:
   PrefModelAssociatorClient* pref_model_associator_client_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefServiceSyncableFactory);
 };
 
 }  // namespace sync_preferences
 
 #endif  // COMPONENTS_SYNC_PREFERENCES_PREF_SERVICE_SYNCABLE_FACTORY_H_