Add an accessibility description for notification

ui/strings/ui_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. Specifically, these are UI strings that are used by app/ that
 need to be translated for each locale.-->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <!-- TODO add each of your output files.  Modify the three below, and add
@@ skipping 586 matching lines @@
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> TB/s
       </message>
       <message name="IDS_APP_PEBIBYTES_PER_SECOND" desc="Units tag indicating a speed of petabytes/second">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> PB/s
       </message>
 
       <!-- Message center -->
       <message name="IDS_MESSAGE_CENTER_ACCESSIBLE_NAME" desc="The accessible name for the Notification Center window.">
         Notification Center
       </message>
+      <message name="IDS_MESSAGE_CENTER_NOTIFICATION_ACCESSIBLE_NAME" desc="The accessible name for a single notification.">
+        Notification
+      </message>
       <message name="IDS_MESSAGE_CENTER_NOTIFIER_DISABLE" desc="The menu entry for disabling a notifier from a notification.">
         Disable notifications from <ph name="notifier_name">$1<ex>Notification Galore!</ex></ph>
       </message>
       <message name="IDS_MESSAGE_CENTER_FOOTER_TITLE" desc="The label in the footer of the message center">
         Notifications
       </message>
       <message name="IDS_MESSAGE_CENTER_FOOTER_LOCKSCREEN" desc="The label in the footer of the message center on lock screen">
         Unlock device to view your notifications
       </message>
       <message name="IDS_MESSAGE_CENTER_SETTINGS_BUTTON_LABEL" desc="The button label for visiting the appropriate settings page in the footer of the message center.">
@@ skipping 100 matching lines @@
       <!-- Display names -->
       <message name="IDS_DISPLAY_NAME_UNKNOWN" desc="The name used for a display whose name is unknown, which is shown in the display settings and ash tray.">
         Unknown Display
       </message>
       <message name="IDS_DISPLAY_NAME_INTERNAL" desc="The name used for internal displays, which is shown in the display settings.">
         Internal Display
       </message>
     </messages>
   </release>
 </grit>