Add a pref to track progress of OOBE and resume if needed.

chrome/browser/chromeos/login/startup_utils.h

Index: chrome/browser/chromeos/login/startup_utils.h
diff --git a/chrome/browser/chromeos/login/startup_utils.h b/chrome/browser/chromeos/login/startup_utils.h
index f87ce4f05a80b09de1acf885878edb46c13fcf04..90866b5627db6b9f2f8b3b46850764568901dbe3 100644
--- a/chrome/browser/chromeos/login/startup_utils.h
+++ b/chrome/browser/chromeos/login/startup_utils.h
@@ -27,6 +27,9 @@ class StartupUtils {
   // Marks OOBE process as completed.
   static void MarkOobeCompleted();
 
+  // Stores the next pending OOBE screen in case it will need to be resumed.
+  static void SaveOobePendingScreen(const std::string& screen);
+
   // Returns device registration completion status, i.e. second part of OOBE.
   static bool IsDeviceRegistered();