Display "Restart to update" dialog to Chrome OS users.

ash/common/system/tray/system_tray_controller.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 "ash/common/system/tray/system_tray_controller.h"
 
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
 
 namespace ash {
@@ skipping 92 matching lines @@
 void SystemTrayController::ShowProxySettings() {
   if (system_tray_client_)
     system_tray_client_->ShowProxySettings();
 }
 
 void SystemTrayController::SignOut() {
   if (system_tray_client_)
     system_tray_client_->SignOut();
 }
 
-void SystemTrayController::RequestRestartForUpdate() {
+void SystemTrayController::RequestRestartForUpdate(bool always_reboot) {
   if (system_tray_client_)
-    system_tray_client_->RequestRestartForUpdate();
+    system_tray_client_->RequestRestartForUpdate(always_reboot);
 }
 
 void SystemTrayController::BindRequest(mojom::SystemTrayRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 void SystemTrayController::SetClient(mojom::SystemTrayClientPtr client) {
   system_tray_client_ = std::move(client);
 }
 
 void SystemTrayController::SetUse24HourClock(bool use_24_hour) {
   hour_clock_type_ = use_24_hour ? base::k24HourClock : base::k12HourClock;
   WmShell::Get()->system_tray_notifier()->NotifyDateFormatChanged();
 }
 
 }  // namespace ash