1) Add initialization error page; 2) Add connection error page.

chrome/browser/chromeos/login/screens/host_pairing_screen.cc

 // Copyright 2014 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/host_pairing_screen.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
@@ skipping 50 matching lines @@
     actor_->Hide();
 }
 
 std::string HostPairingScreen::GetName() const {
   return WizardController::kHostPairingScreenName;
 }
 
 void HostPairingScreen::PairingStageChanged(Stage new_stage) {
   std::string desired_page;
   switch (new_stage) {
+    case HostPairingController::STAGE_INITIALIZATION_ERROR: {
+      desired_page = kPageIntializationError;
+      break;
+    }
     case HostPairingController::STAGE_WAITING_FOR_CONTROLLER:
     case HostPairingController::STAGE_WAITING_FOR_CONTROLLER_AFTER_UPDATE: {
       desired_page = kPageWelcome;
       break;
     }
     case HostPairingController::STAGE_WAITING_FOR_CODE_CONFIRMATION: {
       desired_page = kPageCodeConfirmation;
       context_.SetString(kContextKeyConfirmationCode,
                          remora_controller_->GetConfirmationCode());
       break;
     }
+    case HostPairingController::STAGE_CONTROLLER_CONNECTION_ERROR: {
+      desired_page = kPageConnectionError;
+      break;
+    }
     case HostPairingController::STAGE_SETUP_BASIC_CONFIGURATION: {
       desired_page = kPageSetupBasicConfiguration;
       break;
     }
     case HostPairingController::STAGE_SETUP_NETWORK_ERROR: {
       desired_page = kPageSetupNetworkError;
       break;
     }
     case HostPairingController::STAGE_WAITING_FOR_CREDENTIALS: {
       desired_page = kPageEnrollmentIntroduction;
@@ skipping 101 matching lines @@
 }
 
 void HostPairingScreen::OnAnyEnrollmentError() {
   enrollment_helper_->ClearAuth(base::Bind(&HostPairingScreen::OnAuthCleared,
                                            weak_ptr_factory_.GetWeakPtr()));
   remora_controller_->OnEnrollmentStatusChanged(
       HostPairingController::ENROLLMENT_STATUS_FAILURE);
 }
 
 }  // namespace chromeos