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

chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENROLLMENT_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENROLLMENT_SCREEN_HANDLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
 #include "chrome/browser/chromeos/login/enrollment/enrollment_screen_actor.h"
 #include "chrome/browser/chromeos/login/ui/webui_login_view.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
 
 namespace policy {
 class PolicyOAuth2TokenFetcher;
 }
 
 namespace chromeos {
 
 class AuthenticatedUserEmailRetriever;
+class ErrorScreensHistogramHelper;
 
 // WebUIMessageHandler implementation which handles events occurring on the
 // page, such as the user pressing the signin button.
 class EnrollmentScreenHandler
     : public BaseScreenHandler,
       public EnrollmentScreenActor,
       public BrowsingDataRemover::Observer,
       public NetworkStateInformer::NetworkStateInformerObserver,
       public WebUILoginView::FrameObserver {
  public:
@@ skipping 105 matching lines @@
   scoped_ptr<AuthenticatedUserEmailRetriever> email_retriever_;
 
   // Latest enrollment frame error.
   net::Error frame_error_;
 
   // Network state informer used to keep signin screen up.
   scoped_refptr<NetworkStateInformer> network_state_informer_;
 
   ErrorScreenActor* error_screen_actor_;
 
+  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
+
   base::WeakPtrFactory<EnrollmentScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnrollmentScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENROLLMENT_SCREEN_HANDLER_H_