Added processing for a lost status to UpdateEngineClient.

chromeos/dbus/update_engine_client.cc

Index: chromeos/dbus/update_engine_client.cc
diff --git a/chromeos/dbus/update_engine_client.cc b/chromeos/dbus/update_engine_client.cc
index e9f68f8f02a63908117507740c24d71f51addfd3..309adc33b35c316dc2f99c3fdbb4b9593bfc0417 100644
--- a/chromeos/dbus/update_engine_client.cc
+++ b/chromeos/dbus/update_engine_client.cc
@@ -54,6 +54,8 @@ UpdateEngineClient::UpdateStatusOperation UpdateStatusFromString(
     return UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT;
   if (str == update_engine::kUpdateStatusReportingErrorEvent)
     return UpdateEngineClient::UPDATE_STATUS_REPORTING_ERROR_EVENT;
+  if (str == update_engine::kUpdateStatusAttemptingRollback)
+    return UpdateEngineClient::UPDATE_STATUS_ATTEMPTING_ROLLBACK;
   return UpdateEngineClient::UPDATE_STATUS_ERROR;
 }
 
@@ -478,6 +480,7 @@ class UpdateEngineClientFakeImpl : public UpdateEngineClientStubImpl {
       case UPDATE_STATUS_IDLE:
       case UPDATE_STATUS_UPDATED_NEED_REBOOT:
       case UPDATE_STATUS_REPORTING_ERROR_EVENT:
+      case UPDATE_STATUS_ATTEMPTING_ROLLBACK:
         return;
       case UPDATE_STATUS_CHECKING_FOR_UPDATE:
         next_status = UPDATE_STATUS_UPDATE_AVAILABLE;