Site Settings Desktop: Support adding exceptions for incognito mode.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_DETAILED_BUILD_INFO" desc="Label describing the section that shows detailed information about the current Chrome build.">
       Detailed build information
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_ARC_VERSION" desc="Label for ARC version">
       ARC Version
@@ skipping 1683 matching lines @@
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLER_IS_DEFAULT" desc="A label showing that a certain handler for a given protocol is the default.">
     Default
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLER_SET_DEFAULT" desc="A label for the action of making a certain handler the default for a given protocol.">
     Set as default
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_REMOVE" desc="A label for the action of removing (deleting) a certain handler.">
     Remove
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_INCOGNITO_ONLY" desc="A label for the checkbox to make the rule apply to the current incognito session only.">
+    Current incognito session only
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_INCOGNITO" desc="A label for a site rule that only applies to the current incognito session.">
+    Current incognito session
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_INCOGNITO_EMBEDDED" desc="A label for a site rule that specifies an embedded origin and only applies to the current incognito session.">
+    Current incognito session (<ph name="EMBEDDING">$1<ex>embedded on google.com</ex></ph>)
+  </message>
 
   <!-- Sync / People Page -->
   <message name="IDS_SETTINGS_PEOPLE" desc="Name of the settings page which manages Chrome's signed-in Google profile.">
     People
   </message>
   <message name="IDS_SETTINGS_PEOPLE_MANAGE_OTHER_PEOPLE" desc="Label for the button that opens the multi-profile user manager.">
     Manage other people
   </message>
   <message name="IDS_SETTINGS_PEOPLE_MANAGE_SUPERVISED_USERS" desc="Label for the button that opens the supervised users dashboard.">
     Manage supervised users
@@ skipping 510 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>