[cros] Report captive portal message when we suspect that might be the case.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 11197 matching lines @@
       </message>
       <message name="IDS_LOGIN_ERROR_OFFLINE_FAILED_NETWORK_NOT_CONNECTED" desc="Couldn't sign in because offline sign-in has failed and network is not connected">
         Offline sign-in failed and network not connected
       </message>
       <message name="IDS_LOGIN_ERROR_NO_NETWORK_LIBRARY" desc="Couldn't sign in because nework library couldn't be loaded">
         Can't access network library
       </message>
       <message name="IDS_LOGIN_ERROR_KEYBOARD_SWITCH_HINT" desc="A hint text for the login and lock screens">
         Hit Shift-Alt to switch keyboard layout
       </message>
+      <message name="IDS_LOGIN_ERROR_CAPTIVE_PORTAL" desc="An error message shown when we suggest that user may be behind the captive portal.">
+        There is a problem with your Internet connectivity. Please launch a guest session to fix this.
+      </message>
+      <message name="IDS_LOGIN_FIX_CAPTIVE_PORTAL" desc="An link text to fix Internet connection (captive portal) in guest mode.">
+        Launch guest session
+      </message>
       <message name="IDS_NOTIFICATION_PANEL_TITLE" desc="Text for the title of the notification panel.">
         Notifications
       </message>
       <message name="IDS_GUEST" desc="Shown in login panel for users that would like to browse without signing in.">
         Guest
       </message>
       <message name="IDS_ADD_USER" desc="Shown in login panel for adding new user to login screen.">
         Add a user
       </message>
       <message name="IDS_LANGUAGES_MORE" desc="Main language list 'more' link. Expands all possible languages, not only the main ones.">
@@ skipping 135 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>