Componentize more signin code

components/signin/core/browser/account_tracker_service.cc

 // 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.
 
 #include "components/signin/core/browser/account_tracker_service.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
+#include "components/pref_registry/pref_registry_syncable.h"
 #include "components/signin/core/browser/signin_client.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/signin/core/common/signin_pref_names.h"
 
 namespace {
 
 const char kAccountKeyPath[] = "account_id";
 const char kAccountEmailPath[] = "email";
 const char kAccountGaiaPath[] = "gaia";
 const char kAccountHostedDomainPath[] = "hd";
@@ skipping 22 matching lines @@
 
 
 const char AccountTrackerService::kAccountInfoPref[] = "account_info";
 
 AccountTrackerService::AccountTrackerService()
     : signin_client_(NULL) {}
 
 AccountTrackerService::~AccountTrackerService() {
 }
 
+// static
+void AccountTrackerService::RegisterPrefs(
+    user_prefs::PrefRegistrySyncable* registry) {
+  registry->RegisterListPref(AccountTrackerService::kAccountInfoPref);
+  registry->RegisterIntegerPref(prefs::kAccountIdMigrationState,
+                                AccountTrackerService::MIGRATION_NOT_STARTED);
+}
+
 void AccountTrackerService::Initialize(SigninClient* signin_client) {
   DCHECK(signin_client);
   DCHECK(!signin_client_);
   signin_client_ = signin_client;
   LoadFromPrefs();
 }
 
 void AccountTrackerService::Shutdown() {
 }
 
@@ skipping 330 matching lines @@
     if(!ContainsKey(accounts_, info.account_id)) {
       SeedAccountInfo(info.gaia, info.email);
     }
 
     AccountState& state = accounts_[info.account_id];
     state.info = info;
     NotifyAccountUpdated(state);
     SaveToPrefs(state);
   }
 }