[cros] Add network tray item for mobile network setup.

ash/ash_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains the strings for ash.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/ash_strings.h" type="rc_header">
@@ skipping 222 matching lines @@
       </message>
       <message name="IDS_ASH_STATUS_TRAY_OTHER_WIFI" desc="The label used for the item to display other Wi-Fi networks.">
         Wi-Fi ...
       </message>
       <message name="IDS_ASH_STATUS_TRAY_ENABLE_MOBILE" desc="The label used for the item to enable cellular networks.">
         Enable mobile data
       </message>
       <message name="IDS_ASH_STATUS_TRAY_DISABLE_MOBILE" desc="The label used for the item to disable cellular networks.">
         Disable mobile data
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_SETUP_MOBILE" desc="The label used for the item to setup cellular network when no SIM card in installed.">
+        Setup mobile data
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_OTHER_MOBILE" desc="The label used for the item to display other cellular networks.">
         Mobile ...
       </message>
       <message name="IDS_ASH_STATUS_TRAY_MOBILE_VIEW_ACCOUNT" desc="In the network popup bubble, the text of the top-up URL link.">
         View mobile account
       </message>
       <message name="IDS_ASH_STATUS_TRAY_UPDATE" desc="The label used in the tray popup to notify that the user should restart to get system updates.">
         Restart to update
       </message>
       <message name="IDS_ASH_STATUS_TRAY_BLUETOOTH" desc="The label used as the header in the bluetooth popup.">
@@ skipping 65 matching lines @@
       <message name="IDS_ASH_SECONDARY_MONITOR_SHORTCUT" desc="The shortcut text on the secondary monitors.">
         Ctrl + 
       </message>
       <message name="IDS_ASH_STATUS_TRAY_PREVIOUS_MENU" desc="The accessible text for header entries for detailed versions of status tray items.">
         Previous menu
       </message>
     </messages>
   </release>
 </grit>