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

components/pairing/host_pairing_controller.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 COMPONENTS_PAIRING_HOST_PAIRING_CONTROLLER_H_
 #define COMPONENTS_PAIRING_HOST_PAIRING_CONTROLLER_H_
 
 #include <string>
 
 #include "base/macros.h"
 
 namespace pairing_chromeos {
 
 class HostPairingController {
  public:
   enum Stage {
     STAGE_NONE,
     STAGE_INITIALIZATION_ERROR,
     STAGE_WAITING_FOR_CONTROLLER,
     STAGE_WAITING_FOR_CODE_CONFIRMATION,
+    STAGE_CONTROLLER_CONNECTION_ERROR,
     STAGE_SETUP_BASIC_CONFIGURATION,
     STAGE_SETUP_NETWORK_ERROR,
     STAGE_WAITING_FOR_CONTROLLER_AFTER_UPDATE,
     STAGE_WAITING_FOR_CREDENTIALS,
     STAGE_ENROLLING,
     STAGE_ENROLLMENT_ERROR,
     STAGE_ENROLLMENT_SUCCESS,
     STAGE_FINISHED
   };
 
@@ skipping 82 matching lines @@
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HostPairingController);
 };
 
 }  // namespace pairing_chromeos
 
 #endif  // COMPONENTS_PAIRING_HOST_PAIRING_CONTROLLER_H_