Added UI to enable debugging features on CrOS

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 74dda856b23f502ad7d1dba44240b9ec003631c9..60543357fd337788bd57fd7eabd8742785f98642 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -150,6 +150,9 @@ class SigninScreenHandlerDelegate {
   // Shows Enterprise Enrollment screen.
   virtual void ShowEnterpriseEnrollmentScreen() = 0;
 
+  // Shows Enable Developer Features screen.
+  virtual void ShowEnableDebuggingScreen() = 0;
+
   // Shows Kiosk Enable screen.
   virtual void ShowKioskEnableScreen() = 0;
 
@@ -373,6 +376,7 @@ class SigninScreenHandler
   void HandleRemoveUser(const std::string& email);
   void HandleShowAddUser(const base::ListValue* args);
   void HandleToggleEnrollmentScreen();
+  void HandleToggleEnableDebuggingScreen();
   void HandleToggleKioskEnableScreen();
   void HandleToggleResetScreen();
   void HandleToggleKioskAutolaunchScreen();