cros: Update ash when prefs related to lock are changed

chrome/browser/ui/ash/session_controller_client.cc

 // Copyright 2016 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/ui/ash/session_controller_client.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "ash/public/cpp/session_types.h"
 #include "ash/public/interfaces/constants.mojom.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/user_flow.h"
 #include "chrome/browser/chromeos/login/users/chrome_user_manager.h"
 #include "chrome/browser/chromeos/login/users/multi_profile_user_controller.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/supervised_user/supervised_user_service.h"
 #include "chrome/browser/supervised_user/supervised_user_service_factory.h"
 #include "chrome/browser/ui/ash/multi_user/user_switch_util.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/theme_resources.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
+#include "components/prefs/pref_change_registrar.h"
 #include "components/prefs/pref_service.h"
 #include "components/session_manager/core/session_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/common/service_manager_connection.h"
 #include "content/public/common/service_names.mojom.h"
 #include "mojo/public/cpp/bindings/equals_traits.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image_skia.h"
 
@@ skipping 331 matching lines @@
   if (profile->IsSupervised()) {
     // There can be only one supervised user per session.
     DCHECK(!supervised_user_profile_);
     supervised_user_profile_ = profile;
 
     // Watch for changes to supervised user manager/custodians.
     SupervisedUserServiceFactory::GetForProfile(supervised_user_profile_)
         ->AddObserver(this);
   }
 
+  base::Closure session_info_changed_closure =
+      base::Bind(&SessionControllerClient::SendSessionInfoIfChanged,
+                 weak_ptr_factory_.GetWeakPtr());
+  std::unique_ptr<PrefChangeRegistrar> pref_change_registrar =
+      base::MakeUnique<PrefChangeRegistrar>();
+  pref_change_registrar->Init(profile->GetPrefs());
+  pref_change_registrar->Add(prefs::kAllowScreenLock,
+                             session_info_changed_closure);
+  pref_change_registrar->Add(prefs::kEnableAutoScreenLock,
+                             session_info_changed_closure);
+  pref_change_registrars_.push_back(std::move(pref_change_registrar));
+
   // Needed because the user-to-profile mapping isn't available until later,
   // which is needed in UserToUserSession().
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(&SessionControllerClient::SendUserSessionForProfile,
                             weak_ptr_factory_.GetWeakPtr(), profile));
 }
 
 void SessionControllerClient::SendUserSessionForProfile(Profile* profile) {
   DCHECK(profile);
   const User* user = chromeos::ProfileHelper::Get()->GetUserByProfile(profile);
@@ skipping 48 matching lines @@
   const UserList logged_in_users = user_manager->GetLoggedInUsers();
   std::vector<uint32_t> user_session_ids;
   for (auto* user : user_manager->GetLRULoggedInUsers()) {
     const uint32_t user_session_id = GetSessionId(*user);
     DCHECK_NE(0u, user_session_id);
     user_session_ids.push_back(user_session_id);
   }
 
   session_controller_->SetUserSessionOrder(user_session_ids);
 }