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

chrome/browser/chromeos/login/screens/host_pairing_screen_actor.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HOST_PAIRING_SCREEN_ACTOR_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HOST_PAIRING_SCREEN_ACTOR_H_
 
 #include "base/macros.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace chromeos {
 
 namespace host_pairing {
 
 // Keep these constants synced with corresponding constants defined in
 // oobe_screen_host_pairing.js.
 // Conxtext keys.
 extern const char kContextKeyPage[];
 extern const char kContextKeyDeviceName[];
 extern const char kContextKeyConfirmationCode[];
 extern const char kContextKeyEnrollmentDomain[];
 extern const char kContextKeyUpdateProgress[];
 
 // Pages names.
 extern const char kPageWelcome[];
+extern const char kPageIntializationError[];
 extern const char kPageCodeConfirmation[];
+extern const char kPageConnectionError[];
 extern const char kPageSetupBasicConfiguration[];
 extern const char kPageSetupNetworkError[];
 extern const char kPageUpdate[];
 extern const char kPageEnrollmentIntroduction[];
 extern const char kPageEnrollment[];
 extern const char kPageEnrollmentError[];
 extern const char kPagePairingDone[];
 
 }  // namespace host_pairing
 
@@ skipping 13 matching lines @@
   virtual void SetDelegate(Delegate* delegate) = 0;
   virtual void OnContextChanged(const base::DictionaryValue& diff) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HostPairingScreenActor);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HOST_PAIRING_SCREEN_ACTOR_H_