Add countdown when session time is limited

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 491 matching lines @@
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NETWORK_INFO" desc="The accessible text for the network info button.">
         Network Info
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NO_NETWORKS" desc="The message to display in the network info bubble when it is otherwise empty.">
         No network information available
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NETWORK_CONNECTING" desc="Shows a connecting network in the network list.">
         <ph name="NETWORK">$1<ex>GoogleGuest</ex></ph>: Connecting...
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_REMAINING_SESSION_TIME" desc="The time remaining until the end of the session. Shown if the session length is limited.">
+        <ph name="hours">$1<ex>01</ex></ph>:<ph name="minutes">$2<ex>35</ex></ph>:<ph name="seconds">$3<ex>12</ex></ph>
+      </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>
       <message name="IDS_ASH_WEB_NOTIFICATION_TRAY_ACCESSIBLE_NAME" desc="The accessible name of the web notification tray (message center).">
         Message Center
       </message>
 
       <message name="IDS_ASH_MAXIMIZE_WINDOW" desc="A help text to show that when the button gets clicked the window get maximized.">
         Maximize
@@ skipping 13 matching lines @@
       <message name="IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING" desc="An error message to show that the system failed to enter the mirroring mode.">
         Can't duplicate image on attached monitors. No matching resolution found.
       </message>
       <message name="IDS_ASH_INTERNAL_DISPLAY_NAME" desc="The name of the internal display which is shown in the display settings.">
         Internal Display
       </message>
     </messages>
   </release>
 </grit>