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

chrome/browser/chromeos/login/screens/update_screen.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_CHROMEOS_LOGIN_SCREENS_UPDATE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_UPDATE_SCREEN_H_
 
 #include <set>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/chromeos/login/screens/update_screen_actor.h"
 #include "chrome/browser/chromeos/login/screens/wizard_screen.h"
 #include "chromeos/dbus/update_engine_client.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 
 namespace chromeos {
 
 class ErrorScreen;
+class ErrorScreensHistogramHelper;
 class NetworkState;
 class ScreenObserver;
 
 // Controller for the update screen. It does not depend on the specific
 // implementation of the screen showing (Views of WebUI based), the dependency
 // is moved to the UpdateScreenActor instead.
 class UpdateScreen: public UpdateEngineClient::Observer,
                     public UpdateScreenActor::Delegate,
                     public WizardScreen,
                     public NetworkPortalDetector::Observer {
@@ skipping 120 matching lines @@
   double download_average_speed_;
 
   // True if there was no notification from NetworkPortalDetector
   // about state for the default network.
   bool is_first_detection_notification_;
 
   // True if there was no notification about captive portal state for
   // the default network.
   bool is_first_portal_notification_;
 
+  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
+
   base::WeakPtrFactory<UpdateScreen> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_UPDATE_SCREEN_H_