[ash] Add TYPE_DIALOG and its item's LauncherContextMenu

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 170 matching lines @@
       </message>
       <message name="IDS_ASH_SHELF_CONTEXT_MENU_ALIGN_BOTTOM" desc="Title of the menu item in the context menu for aligning the shelf to the bottom of the screen">
         Bottom
       </message>
       <message name="IDS_ASH_SHELF_CONTEXT_MENU_ALIGN_LEFT" desc="Title of the menu item in the context menu for aligning the shelf to the left of the screen">
         Left
       </message>
       <message name="IDS_ASH_SHELF_CONTEXT_MENU_ALIGN_RIGHT" desc="Title of the menu item in the context menu for aligning the shelf to the right of the screen">
         Right
       </message>
+      <message name="IDS_ASH_SHELF_CONTEXT_MENU_CLOSE" desc="Title of the menu item in the context menu for closing a Window associated with this item">
+        Close
+      </message>
       <message name="IDS_ASH_SHELF_ACCESSIBLE_NAME" desc="The accessible name of the shelf.">
         Shelf
       </message>
 
       <message name="IDS_AURA_SET_DESKTOP_WALLPAPER" desc="The label used for change wallpaper in context menu">
         Set wallpaper...
       </message>
 
       <message name="IDS_ASH_KEYBOARD_OVERLAY_TITLE" desc="The title of the keyboard overlay.">
         Keyboard Overlay
@@ skipping 386 matching lines @@
 
       <!-- ChromeOS-specific strings -->
       <if expr="pp_ifdef('chromeos')">
         <part file="ash_chromeos_strings.grdp" />
       </if>
 
     </messages>
   </release>
 </grit>