Notificaiton Message for Unified mode

ash/ash_chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from ash_strings.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
 
   <!-- Status tray charging strings. -->
   <message name="IDS_ASH_STATUS_TRAY_LOW_POWER_CHARGER_TITLE" desc="The title of a notification indicating that a low-current USB charger has been connected.">
     Low-power charger connected
   </message>
   <message name="IDS_ASH_STATUS_TRAY_LOW_POWER_CHARGER_MESSAGE" desc="The message body of a notification indicating that a low-current USB charger has been connected.">
@@ skipping 231 matching lines @@
   </message>
   <message name="IDS_ASH_STATUS_TRAY_DISPLAY_ORIENTATION_90" desc="The value of display orientation option item: 90-degree rotated">
     90&#x00B0;
   </message>
   <message name="IDS_ASH_STATUS_TRAY_DISPLAY_ORIENTATION_180" desc="The value of display orientation option item: 180-degree rotated">
     180&#x00B0;
   </message>
   <message name="IDS_ASH_STATUS_TRAY_DISPLAY_ORIENTATION_270" desc="The value of display orientation option item: 270-degree rotated">
     270&#x00B0;
   </message>
+  <message name="IDS_ASH_STATUS_TRAY_DISPLAY_UNIFIED" desc="The title of the notification indicating that the system is in unified desktop mode.">
+    Unified desktop mode
+  </message>
   <message name="IDS_ASH_STATUS_TRAY_CAPS_LOCK_ENABLED" desc="The label used for the tray item to indicate caps lock is on and to toggle caps lock by the click.">
     CAPS LOCK is on
   </message>
   <message name="IDS_ASH_STATUS_TRAY_CAPS_LOCK_DISABLED" desc="The label used for the tray item to indicate caps lock is on and to toggle caps lock by the click.">
     CAPS LOCK is off
   </message>
   <message name="IDS_ASH_STATUS_TRAY_CAPS_LOCK_SHORTCUT_SEARCH" desc="The shortcut text used for the caps lock tray item.">
     Search
   </message>
   <message name="IDS_ASH_STATUS_TRAY_CAPS_LOCK_SHORTCUT_SEARCH_OR_SHIFT" desc="The shortcut text used for the caps lock tray item.">
@@ skipping 150 matching lines @@
   <message name="IDS_ASH_LOGOUT_CONFIRMATION_BUTTON" desc="The text for okay button of the logout confirmation dialog.">
     Sign out now
   </message>
   <message name="IDS_ASH_STATUS_TRAY_NEW_LOGIN_UI_ENABLED" desc="The text shown in the tray menu when the WebView-based sign-in is enabled.">
     New login UI is ON
   </message>
   <message name="IDS_ASH_STATUS_TRAY_NEW_LOGIN_UI_DISABLED" desc="The text shown in the tray menu when the WebView-based sign-in is disabled.">
     New login UI is OFF
   </message>
 </grit-part>