[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 7aa78be013b88eba0519deed1f4fd1fd8f66a576..fdae2e8837047738ebee25dfd2426c8491f2ed56 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6547,6 +6547,12 @@ 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>
@@ -7527,6 +7533,11 @@ The following plug-in is unresponsive: <ph name="PLUGIN_NAME">$1
       <message name="IDS_PASSWORDS_PAGE_VIEW_NO_EXCEPTIONS_DESCRIPTION" desc="Text for passwords page view when there are no password exceptions to show.">
         Sites which never save passwords will appear here.
       </message>
+      <if expr="is_macosx">
+        <message name="IDS_PASSWORDS_PAGE_AUTHENTICATION_PROMPT" desc="Text for the dialog box that prompts the user for their OS account password before revealing plaintext passwords on the password page.">
+          <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> is trying to show passwords.
+        </message>
+      </if>
 
       <!-- Confirm MessageBox Dialog -->
       <message name="IDS_CONFIRM_MESSAGEBOX_YES_BUTTON_LABEL" desc="Confirm MessageBox Dialog's 'Yes' button text">