Adds a new checkbox for backup and restore in opt-in flow.

chrome/browser/chromeos/arc/arc_auth_service.cc

 // Copyright 2015 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 "chrome/browser/chromeos/arc/arc_auth_service.h"
 
 #include <utility>
 
 #include "ash/shelf/shelf_delegate.h"
 #include "ash/shell.h"
@@ skipping 22 matching lines @@
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/cryptohome/cryptohome_parameters.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
 #include "components/pref_registry/pref_registry_syncable.h"
+#include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/syncable_prefs/pref_service_syncable.h"
 #include "components/user_manager/user.h"
 #include "extensions/browser/app_window/app_window_registry.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace arc {
 
@@ skipping 69 matching lines @@
 // static
 void ArcAuthService::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kArcEnabled, false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterBooleanPref(prefs::kArcSignedIn, false);
 }
 
 // static
+void ArcAuthService::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterBooleanPref(prefs::kArcBackupRestoreEnabled, false);

[xiyuan, 2016/06/29 21:36:38]

Think this should be part of user prefs and we should do it with
ArcAuthService::RegisterProfilePrefs above.

+}
+
+// static
 void ArcAuthService::DisableUIForTesting() {
   disable_ui_for_testing = true;
 }
 
 // static
 void ArcAuthService::SetShelfDelegateForTesting(
     ash::ShelfDelegate* shelf_delegate) {
   shelf_delegate_for_testing = shelf_delegate;
 }
 
@@ skipping 579 matching lines @@
       return os << kStateFetchingCode;
     case ArcAuthService::State::ACTIVE:
       return os << kStateActive;
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc