[Mac] Add option to reauthenticate the OS user before revealing passwords.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 1d5949b166a4c4c11f082f4e607cc745e94f5580..a7e8c4f56f660641c51d89e1aab86e75129e5e7f 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6593,6 +6593,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_PASSWORD_AUTOFILL_PUBLIC_SUFFIX_DOMAIN_MATCHING_DESCRIPTION" desc="Description of flag to enable or disable public suffix domain matching for autofill of passwords.">
         Enable or disable a feature which allows the user to select username/password combinations for domains that match the same public suffix registry domain.
       </message>
+      <message name="IDS_FLAGS_PASSWORD_MANAGER_REAUTHENTICATION_NAME" desc="Name of the flag for the password manager reauthentication option.">
+        Password Manager Reauthentication
+      </message>
+      <message name="IDS_FLAGS_PASSWORD_MANAGER_REAUTHENTICATION_DESCRIPTION" desc="Description of the flag for the password manager reauthentication option.">
+        Prompt the user for their OS password before revealing passwords on the passwords page.
+      </message>
       <message name="IDS_FLAGS_ENABLE_PEOPLE_SEARCH_NAME" desc="Name of the flag to enable people search.">
         Enable people search.
       </message>