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

chrome/browser/chromeos/login/screens/host_pairing_screen_actor.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_actor.h"
 
 namespace chromeos {
 
 namespace host_pairing {
 
 // Keep these constants synced with corresponding constants defined in
 // oobe_screen_host_pairing.js.
 const char kContextKeyPage[] = "page";
 const char kContextKeyDeviceName[] = "deviceName";
 const char kContextKeyConfirmationCode[] = "code";
 const char kContextKeyEnrollmentDomain[] = "enrollmentDomain";
 const char kContextKeyUpdateProgress[] = "updateProgress";
 
 const char kPageWelcome[] = "welcome";
+const char kPageIntializationError[] = "initialization-error";
 const char kPageCodeConfirmation[] = "code-confirmation";
+const char kPageConnectionError[] = "connection-error";
 const char kPageSetupBasicConfiguration[] = "setup-basic-configuration";
 const char kPageSetupNetworkError[] = "setup-network-error";
 const char kPageUpdate[] = "update";
 const char kPageEnrollmentIntroduction[] = "enrollment-introduction";
 const char kPageEnrollment[] = "enrollment";
 const char kPageEnrollmentError[] = "enrollment-error";
 const char kPagePairingDone[] = "pairing-done";
 
 }  // namespace host_pairing
 
 HostPairingScreenActor::HostPairingScreenActor() {
 }
 
 HostPairingScreenActor::~HostPairingScreenActor() {
 }
 
 }  // namespace chromeos