Site Settings Desktop: Support adding exceptions for incognito mode.

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index 756b383cdf0517997fc4009a3db9629eb21fcb98..878ae3e8377f1ee0f7f758b3925c4ece9582b8d0 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -1701,6 +1701,15 @@
   <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.">