ChromeOS: user whitelist check should happen before entering password.

chrome/browser/chromeos/login/ui/login_display.h

Index: chrome/browser/chromeos/login/ui/login_display.h
diff --git a/chrome/browser/chromeos/login/ui/login_display.h b/chrome/browser/chromeos/login/ui/login_display.h
index 6512bcf854c38168b41e728a48c9403f5b9d5e04..7ed2e508fcfaf29e24cb62261704049ef04bfa9f 100644
--- a/chrome/browser/chromeos/login/ui/login_display.h
+++ b/chrome/browser/chromeos/login/ui/login_display.h
@@ -93,6 +93,9 @@ class LoginDisplay {
     // Restarts the public-session auto-login timer if it is running.
     virtual void ResetPublicSessionAutoLoginTimer() = 0;
 
+    // Returns true if user is allowed to log in by domain policy.
+    virtual bool IsUserWhitelisted(const std::string& user_id) = 0;
+
    protected:
     virtual ~Delegate();
   };