When critical updates have been installed and the user has been idle for quite some time, show a ...

chrome/app/resources/locale_settings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/locale_settings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="locale_settings_am.pak" type="data_package" lang="am" />
     <output filename="locale_settings_ar.pak" type="data_package" lang="ar" />
     <if expr="pp_ifdef('use_third_party_translations')">
       <output filename="locale_settings_ast.pak" type="data_package" lang="ast" />
@@ skipping 241 matching lines @@
 
       <!-- The width and height of the About dialog box in characters and lines (See -->
       <!-- above). -->
       <message name="IDS_ABOUT_DIALOG_WIDTH_CHARS" use_name_for_id="true">
         86
       </message>
       <message name="IDS_ABOUT_DIALOG_MINIMUM_HEIGHT_LINES" use_name_for_id="true">
         4
       </message>
 
+      <!-- The width of the Crucial Notification bubble in characters (See above). -->
+      <message name="IDS_CRUCIAL_NOTIFICATION_BUBBLE_WIDTH_CHARS" use_name_for_id="true">
+        55
+      </message>
+
       <!-- The width and height of the Join Wi-Fi network dialog box in -->
       <!-- characters and lines (See above). -->
       <message name="IDS_JOIN_WIFI_NETWORK_DIALOG_WIDTH_CHARS" use_name_for_id="true">
         60
       </message>
       <message name="IDS_JOIN_WIFI_NETWORK_DIALOG_MINIMUM_HEIGHT_LINES" use_name_for_id="true">
         4
       </message>
 
       <!-- The height of the advanced Join Wi-Fi network dialog box in lines. -->
@@ skipping 247 matching lines @@
         </message>
       </if>
 
       <!-- The width of the default search engine dialog in characters -->
       <message name="IDS_DEFAULT_SEARCH_WIDTH_CHARS" use_name_for_id="true">
         82
       </message>
     </messages>
   </release>
 </grit>