Add support for a virtual display on ChromeOS

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 361 matching lines @@
       <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_NOTIFICATION_UNREAD_COUNT_NINE_PLUS" desc="The text shown in the notification icon for the unread count when the count is more than 9.">
         9+
       </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>
+      <message name="IDS_ASH_VIRTUAL_DISPLAY_NAME" desc="The name of the virtual display which is shown in the display settings.">
+        Virtual Display
+      </message>
       <message name="IDS_ASH_EXIT_WARNING_POPUP_TEXT" desc="The text of the popup when the user preses the exit shortcut.">
         Press Ctrl+Shift+Q twice to quit.
       </message>
       <message name="IDS_ASH_EXIT_WARNING_POPUP_TEXT_ACCESSIBLE" desc="The message used by accessibility to indicate the content of the popup when the user preses the exit shortcut.">
         Press Control Shift Q twice to quit.
       </message>
 
       <message name="IDS_ASH_CONTROL_KEY" desc="Name of [Ctrl] key name. Shouldn't be translated in many languages actually. This name should be lower case.">
         ctrl
       </message>
@@ skipping 35 matching lines @@
 
       <!-- ChromeOS-specific strings -->
       <if expr="chromeos">
         <part file="ash_chromeos_strings.grdp" />
       </if>
 
     </messages>
   </release>
 </grit>