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

chrome/browser/lifetime/application_lifetime.cc

 // Copyright (c) 2012 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/lifetime/application_lifetime.h"
 
 #include <memory>
 #include <string>
 
 #if defined(OS_WIN)
@@ skipping 340 matching lines @@
   if (notified)
     return;
   notified = true;
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_APP_TERMINATING,
       content::NotificationService::AllSources(),
       content::NotificationService::NoDetails());
 }
 
 void NotifyAndTerminate(bool fast_path) {
+  NotifyAndTerminate(fast_path, RebootPolicy::kOptionalReboot);
+}
+
+void NotifyAndTerminate(bool fast_path, RebootPolicy reboot_policy) {
 #if defined(OS_CHROMEOS)
   static bool notified = false;
   // Return if a shutdown request has already been sent.
   if (notified)
     return;
   notified = true;
 #endif
 
   if (fast_path)
     NotifyAppTerminating();
 
 #if defined(OS_CHROMEOS)
   if (chromeos::PowerPolicyController::IsInitialized())
     chromeos::PowerPolicyController::Get()->NotifyChromeIsExiting();
 
   if (base::SysInfo::IsRunningOnChromeOS()) {
     // If we're on a ChromeOS device, reboot if an update has been applied,
     // or else signal the session manager to log out.
-    chromeos::UpdateEngineClient* update_engine_client
-        = chromeos::DBusThreadManager::Get()->GetUpdateEngineClient();
+    chromeos::UpdateEngineClient* update_engine_client =
+        chromeos::DBusThreadManager::Get()->GetUpdateEngineClient();
     if (update_engine_client->GetLastStatus().status ==
-        chromeos::UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT) {
+            chromeos::UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT ||
+        reboot_policy == RebootPolicy::kForceReboot) {
       update_engine_client->RebootAfterUpdate();
     } else if (g_send_stop_request_to_session_manager) {
       // Don't ask SessionManager to stop session if the shutdown request comes
       // from session manager.
-      chromeos::DBusThreadManager::Get()->GetSessionManagerClient()
+      chromeos::DBusThreadManager::Get()
+          ->GetSessionManagerClient()
           ->StopSession();
     }
   } else {
     if (g_send_stop_request_to_session_manager) {
       // If running the Chrome OS build, but we're not on the device, act
       // as if we received signal from SessionManager.
       content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
                                        base::Bind(&ExitCleanly));
     }
   }
 #endif
 }
 
 #if !defined(OS_ANDROID)
 void OnAppExiting() {
   static bool notified = false;
   if (notified)
     return;
   notified = true;
   HandleAppExitingForPlatform();
 }
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace chrome