Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/prefs/pref_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.
 
 // This provides a way to access the application's current preferences.
 
 // Chromium settings and storage represent user-selected preferences and
 // information and MUST not be extracted, overwritten or modified except
 // through Chromium defined APIs.
 
@@ skipping 13 matching lines @@
 class CommandLine;
 class DefaultPrefStore;
 class PersistentPrefStore;
 class PrefModelAssociator;
 class PrefNotifier;
 class PrefNotifierImpl;
 class PrefServiceObserver;
 class PrefStore;
 class PrefValueStore;
 
+namespace base {
+  class SequencedTaskRunner;
+}
+
 namespace syncer {
 class SyncableService;
 }
 
 namespace policy {
 class PolicyService;
 }
 
 namespace subtle {
 class ScopedUserPrefUpdateBase;
@@ skipping 57 matching lines @@
   // |extension_pref_store| is used as the source for extension-controlled
   // preferences and may be NULL.
   // |policy_service| is used as the source for mandatory or recommended
   // policies.
   // The PrefService takes ownership of |extension_pref_store|.
   // If |async| is true, asynchronous version is used.
   // Notifies using PREF_INITIALIZATION_COMPLETED in the end. Details is set to
   // the created PrefService or NULL if creation has failed. Note, it is
   // guaranteed that in asynchronous version initialization happens after this
   // function returned.
-  static PrefService* CreatePrefService(const FilePath& pref_filename,
-                                        policy::PolicyService* policy_service,
-                                        PrefStore* extension_pref_store,
-                                        bool async);
+  static PrefService* CreatePrefService(
+      const FilePath& pref_filename,
+      base::SequencedTaskRunner* pref_io_task_runner,
+      policy::PolicyService* policy_service,
+      PrefStore* extension_pref_store,
+      bool async);
 
   // Creates an incognito copy of the pref service that shares most pref stores
   // but uses a fresh non-persistent overlay for the user pref store and an
   // individual extension pref store (to cache the effective extension prefs for
   // incognito windows).
   PrefService* CreateIncognitoPrefService(PrefStore* incognito_extension_prefs);
 
   virtual ~PrefService();
 
   // Reloads the data from file. This should only be called when the importer
@@ skipping 229 matching lines @@
   // CreatePrefServiceWithPerTabPrefStore() have been called to create a
   // "forked" PrefService.
   bool pref_service_forked_;
 
   ObserverList<PrefServiceObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefService);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_H_