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

chrome/browser/chromeos/login/supervised/supervised_user_creation_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_SUPERVISED_SUPERVISED_USER_CREATION_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SUPERVISED_SUPERVISED_USER_CREATION_SCREEN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/chromeos/camera_presence_notifier.h"
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 #include "chrome/browser/chromeos/login/supervised/supervised_user_creation_controller.h"
 #include "chrome/browser/image_decoder.h"
 #include "chrome/browser/supervised_user/supervised_user_sync_service.h"
 #include "chrome/browser/ui/webui/chromeos/login/supervised_user_creation_screen_handler.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 #include "ui/gfx/image/image_skia.h"
 
 class Profile;
 
 namespace chromeos {
 
+class ErrorScreensHistogramHelper;
 class NetworkState;
 class ScreenManager;
 
 // Class that controls screen showing ui for supervised user creation.
 class SupervisedUserCreationScreen
     : public BaseScreen,
       public SupervisedUserCreationScreenHandler::Delegate,
       public SupervisedUserCreationController::StatusConsumer,
       public SupervisedUserSyncServiceObserver,
       public ImageDecoder::Delegate,
@@ skipping 102 matching lines @@
   bool manager_signin_in_progress_;
   std::string last_page_;
 
   SupervisedUserSyncService* sync_service_;
 
   gfx::ImageSkia user_photo_;
   scoped_refptr<ImageDecoder> image_decoder_;
   bool apply_photo_after_decoding_;
   int selected_image_;
 
+  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
+
   base::WeakPtrFactory<SupervisedUserCreationScreen> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserCreationScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SUPERVISED_SUPERVISED_USER_CREATION_SCREEN_H_