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

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

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index 86f17095194a0f3c94107d66b2381b8dc2ccdf23..74dda856b23f502ad7d1dba44240b9ec003631c9 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -49,6 +49,7 @@ namespace chromeos {
 class AuthenticatedUserEmailRetriever;
 class CaptivePortalWindowProxy;
 class CoreOobeActor;
+class ErrorScreensHistogramHelper;
 class GaiaScreenHandler;
 class NativeWindowDelegate;
 class SupervisedUserCreationScreenHandler;
@@ -537,6 +538,8 @@ class SigninScreenHandler
   // True if SigninScreenHandler has already been added to OobeUI observers.
   bool oobe_ui_observer_added_;
 
+  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
+
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);