Added UI to enable debugging features on CrOS

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 21583496f554c8859aecf5149467d3ed61b4433b..d8878864b2f9572c354dd695553a219e48bc48d5 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -186,6 +186,7 @@
 #include "chrome/browser/metrics/chromeos_metrics_provider.h"
 #include "chrome/browser/ui/webui/chromeos/charger_replacement_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h"
+#include "chrome/browser/ui/webui/chromeos/login/enable_debugging_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
@@ -329,6 +330,7 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
   chromeos::DeviceOAuth2TokenService::RegisterPrefs(registry);
   chromeos::device_settings_cache::RegisterPrefs(registry);
   chromeos::default_pinned_apps_field_trial::RegisterPrefs(registry);
+  chromeos::EnableDebuggingScreenHandler::RegisterPrefs(registry);
   chromeos::language_prefs::RegisterPrefs(registry);
   chromeos::KioskAppManager::RegisterPrefs(registry);
   chromeos::MultiProfileUserController::RegisterPrefs(registry);