Implement users options handling in login screen.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index f1be5c03c2d10ac7692351b86314844142a18413..ee06b9fbcac13ba7ae819b486483041d72c11c61 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -3876,7 +3876,7 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_BAD_FLAGS_WARNING_MESSAGE" desc="Message shown when an unsupported command-line flag is used. [Keep it short so it fits in the infobar.]">
         You are using an unsupported command-line flag: <ph name="BAD_FLAG">$1<ex>--no-sandbox</ex></ph>. Stability and security will suffer.
       </message>
-      
+
       <!-- about:system strings -->
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_ABOUT_SYS_TITLE" desc="about:system page title">
@@ -9512,6 +9512,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
         Korean keyboard layout
       </message>
 
+      <message name="IDS_LOGIN_ERROR_WHITELIST" desc="Couldn't log in because user is not whitelisted.">
+        Sorry, you are not allowed to login on this device.
+      </message>
       <message name="IDS_LOGIN_ERROR_AUTHENTICATING" desc="Couldn't log in because password is invalid">
         Sorry, your password could not be verified. Please try again.
       </message>