AU: Provide a reboot_if_needed D-Bus API.

update_attempter.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_ATTEMPTER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_ATTEMPTER_H__
 
 #include <time.h>
 #include <tr1/memory>
 #include <string>
@@ skipping 68 matching lines @@
 
   void set_dbus_service(struct UpdateEngineService* dbus_service) {
     dbus_service_ = dbus_service;
   }
 
   // This is the D-Bus service entry point for going through an
   // update. If the current status is idle invokes Update.
   void CheckForUpdate(const std::string& app_version,
                       const std::string& omaha_url);
 
+  // Initiates a reboot if the current state is
+  // UPDATED_NEED_REBOOT. Returns true on sucess, false otherwise.
+  bool RebootIfNeeded();
+
   // DownloadActionDelegate method
   void BytesReceived(uint64_t bytes_received, uint64_t total);
 
  private:
   // Sets the status to the given status and notifies a status update
   // over dbus.
   void SetStatusAndNotify(UpdateStatus status);
 
   // Creates an error event object in |error_event_| to be included in
   // an OmahaRequestAction once the current action processor is done.
@@ skipping 32 matching lines @@
 
   // Device paramaters common to all Omaha requests.
   OmahaRequestDeviceParams omaha_request_params_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateAttempter);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_ATTEMPTER_H__