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

chrome/browser/chromeos/login/wizard_controller.cc

 // Copyright (c) 2012 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/wizard_controller.h"
 
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/types.h>
 
@@ skipping 598 matching lines @@
   ShowLoginScreen(LoginScreenContext());
 }
 
 void WizardController::OnUpdateCompleted() {
   const bool is_shark = g_browser_process->platform_part()
                             ->browser_policy_connector_chromeos()
                             ->GetDeviceCloudPolicyManager()
                             ->IsSharkRequisition();
   if (is_shark || IsBootstrappingMaster()) {
     ShowControllerPairingScreen();
-  } else if (IsBootstrappingSlave()) {
+  } else if (IsBootstrappingSlave() && shark_controller_detected_) {

[dzhioev (left Google), 2015/12/17 23:33:32]

What is this change needed for?

[xdai1, 2015/12/17 23:49:08]

The idea is that we should not show the host pairing screen if there is no valid
controller connected with the Chrome OS device even with the slave flag
specified. In this case, we should fall back to the normal manual enrollment
process.

This way, the Chrome OS device with the slave flag specified behaves the same
way as before if there is no bootstrapping attempt nearby.

     ShowHostPairingScreen();
   } else {
     ShowAutoEnrollmentCheckScreen();
   }
 }
 
 void WizardController::OnEulaAccepted() {
   time_eula_accepted_ = base::Time::Now();
   StartupUtils::MarkEulaAccepted();
   InitiateMetricsReportingChange(
@@ skipping 689 matching lines @@
 bool WizardController::SetOnTimeZoneResolvedForTesting(
     const base::Closure& callback) {
   if (timezone_resolved_)
     return false;
 
   on_timezone_resolved_for_testing_ = callback;
   return true;
 }
 
 bool WizardController::IsHostPairingOobe() const {
-  return IsRemoraRequisition() &&
+  return (IsRemoraRequisition() || IsBootstrappingSlave()) &&
          (base::CommandLine::ForCurrentProcess()->HasSwitch(
               switches::kHostPairingOobe) ||
           shark_controller_detected_);
 }
 
 void WizardController::MaybeStartListeningForSharkConnection() {
   if (!IsRemoraRequisition() && !IsBootstrappingSlave())
     return;
 
   // We shouldn't be here if we are running pairing OOBE already.
@@ skipping 44 matching lines @@
             : policy::EnrollmentConfig::MODE_MANUAL_REENROLLMENT;
   }
 
   EnrollmentScreen* screen = EnrollmentScreen::Get(this);
   screen->SetParameters(effective_config, shark_controller_.get());
   SetStatusAreaVisible(true);
   SetCurrentScreen(screen);
 }
 
 }  // namespace chromeos