cros: Break BaseScreenHandler into two classes.

chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_view.h

Index: chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_view.h
diff --git a/chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_view.h b/chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_view.h
index 3259790ae1d2a16487c5b35dab6614df327c6763..72b475e1c49f7fd941b4a4bf416af384e4bcbf82 100644
--- a/chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_view.h
+++ b/chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_view.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_VIEW_H_
 
+#include "chrome/browser/chromeos/login/oobe_screen.h"
+
 namespace chromeos {
 
 // Interface between auto-enrollment check screen and its representation.
@@ -21,6 +23,9 @@ class AutoEnrollmentCheckScreenView {
     virtual void OnViewDestroyed(AutoEnrollmentCheckScreenView* view) = 0;
   };
 
+  constexpr static OobeScreen kScreenId =
+      OobeScreen::SCREEN_AUTO_ENROLLMENT_CHECK;
+
   virtual ~AutoEnrollmentCheckScreenView() {}
 
   virtual void Show() = 0;