UMA: How often are different network error screens encountered during OOBE

chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen.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_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_actor.h"
 #include "chrome/browser/chromeos/login/enrollment/auto_enrollment_controller.h"
 #include "chrome/browser/chromeos/login/screens/error_screen.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 
 namespace chromeos {
 
+class ErrorScreensHistogramHelper;
 class ScreenManager;
 class ScreenObserver;
 
 // Handles the control flow after OOBE auto-update completes to wait for the
 // enterprise auto-enrollment check that happens as part of OOBE. This includes
 // keeping track of current auto-enrollment state and displaying and updating
 // the error screen upon failures. Similar to a screen controller, but it
 // doesn't actually drive a dedicated screen.
 class AutoEnrollmentCheckScreen
     : public AutoEnrollmentCheckScreenActor::Delegate,
@@ skipping 63 matching lines @@
 
   AutoEnrollmentCheckScreenActor* actor_;
   AutoEnrollmentController* auto_enrollment_controller_;
 
   scoped_ptr<AutoEnrollmentController::ProgressCallbackList::Subscription>
       auto_enrollment_progress_subscription_;
 
   NetworkPortalDetector::CaptivePortalStatus captive_portal_status_;
   policy::AutoEnrollmentState auto_enrollment_state_;
 
+  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(AutoEnrollmentCheckScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_H_