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 22277e3daac435a485730d1419bb1633ac1f20b3..e1bd26a379af4eabe3bcffd1444be5add0ad122a 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -149,6 +149,9 @@ 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;
 
@@ -372,6 +375,7 @@ class SigninScreenHandler
   void HandleRemoveUser(const std::string& email);
   void HandleShowAddUser(const base::ListValue* args);
   void HandleToggleEnrollmentScreen();
+  void HandleToggleEnableDebuggingScreen();
   void HandleToggleKioskEnableScreen();
   void HandleToggleResetScreen();
   void HandleToggleKioskAutolaunchScreen();