Added processing for a lost status to UpdateEngineClient.

chrome/browser/chromeos/login/screens/update_screen.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/chromeos/login/screens/update_screen.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 193 matching lines @@
         ExitUpdate(REASON_UPDATE_NON_CRITICAL);
       }
       break;
     case UpdateEngineClient::UPDATE_STATUS_IDLE:
       if (ignore_idle_status_) {
         // It is first IDLE status that is sent before we initiated the check.
         break;
       }
       // else no break
 
+    case UpdateEngineClient::UPDATE_STATUS_ATTEMPTING_ROLLBACK:
+      VLOG(1) << "Attempting rollback";
+      break;
     case UpdateEngineClient::UPDATE_STATUS_ERROR:
     case UpdateEngineClient::UPDATE_STATUS_REPORTING_ERROR_EVENT:
       ExitUpdate(REASON_UPDATE_ENDED);
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
@@ skipping 98 matching lines @@
     case REASON_UPDATE_INIT_FAILED:
       get_screen_observer()->OnExit(
           ScreenObserver::UPDATE_ERROR_CHECKING_FOR_UPDATE);
       break;
     case REASON_UPDATE_NON_CRITICAL:
     case REASON_UPDATE_ENDED:
       {
         UpdateEngineClient* update_engine_client =
             DBusThreadManager::Get()->GetUpdateEngineClient();
         switch (update_engine_client->GetLastStatus().status) {
+          case UpdateEngineClient::UPDATE_STATUS_ATTEMPTING_ROLLBACK:
+            break;
           case UpdateEngineClient::UPDATE_STATUS_UPDATE_AVAILABLE:
           case UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT:
           case UpdateEngineClient::UPDATE_STATUS_DOWNLOADING:
           case UpdateEngineClient::UPDATE_STATUS_FINALIZING:
           case UpdateEngineClient::UPDATE_STATUS_VERIFYING:
             DCHECK(!HasCriticalUpdate());
             // Noncritical update, just exit screen as if there is no update.
             // no break
           case UpdateEngineClient::UPDATE_STATUS_IDLE:
             get_screen_observer()->OnExit(ScreenObserver::UPDATE_NOUPDATE);
@@ skipping 170 matching lines @@
       GetErrorScreen()->SetErrorState(ErrorScreen::ERROR_STATE_PROXY,
                                       std::string());
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 }  // namespace chromeos