Componentize more signin code

components/signin/core/browser/account_tracker_service.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 COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/timer/timer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
 
 class PrefService;
 class SigninClient;
 
 namespace base {
 class DictionaryValue;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // AccountTrackerService is a KeyedService that retrieves and caches GAIA
 // information about Google Accounts.
 class AccountTrackerService : public KeyedService,
                               public base::NonThreadSafe {
  public:
   // Name of the preference property that persists the account information
   // tracked by this service.
   static const char kAccountInfoPref[];
 
   // TODO(mlerman): Remove all references to Profile::kNoHostedDomainFound in
@@ skipping 35 matching lines @@
   // Possible values for the kAccountIdMigrationState preference.
   enum AccountIdMigrationState {
     MIGRATION_NOT_STARTED,
     MIGRATION_IN_PROGRESS,
     MIGRATION_DONE
   };
 
   AccountTrackerService();
   ~AccountTrackerService() override;
 
+  // Registers the preferences used by AccountTrackerService.
+  static void RegisterPrefs(user_prefs::PrefRegistrySyncable* registry);
+
   // KeyedService implementation.
   void Shutdown() override;
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Take a SigninClient rather than a PrefService and a URLRequestContextGetter
   // since RequestContext cannot be created at startup.
   // (see http://crbug.com/171406)
   void Initialize(SigninClient* signin_client);
@@ skipping 50 matching lines @@
   void RemoveFromPrefs(const AccountState& account);
 
   SigninClient* signin_client_;  // Not owned.
   std::map<std::string, AccountState> accounts_;
   base::ObserverList<Observer> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(AccountTrackerService);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_