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

chrome/browser/ui/webui/options/password_manager_handler.h

Index: chrome/browser/ui/webui/options/password_manager_handler.h
diff --git a/chrome/browser/ui/webui/options/password_manager_handler.h b/chrome/browser/ui/webui/options/password_manager_handler.h
index 8dc188edb0840b036bf6946bed0b225a03e7b789..ee392457394e48d1d0f8d1f58d9eb0c13333325f 100644
--- a/chrome/browser/ui/webui/options/password_manager_handler.h
+++ b/chrome/browser/ui/webui/options/password_manager_handler.h
@@ -64,6 +64,10 @@ class PasswordManagerHandler : public OptionsPageUIHandler,
   void SetPasswordList();
   void SetPasswordExceptionList();
 
+  // Returns true if the user needs to be authenticated before a plaintext
+  // password is revealed.
+  bool IsAuthenticationRequired();
+
   // A short class to mediate requests to the password store.
   class ListPopulater : public PasswordStoreConsumer {
    public:
@@ -123,9 +127,13 @@ class PasswordManagerHandler : public OptionsPageUIHandler,
   // Whether to show stored passwords or not.
   BooleanPrefMember show_passwords_;
 
-  // Indicates whether or not the user has recently been authenticated.
-  // Used to determine whether or not to reveal plain text passwords.
-  bool is_user_authenticated_;
+  // Indicates whether or not the password manager should require the user to
+  // reauthenticate before revealing plaintext passwords.
+  bool require_reauthentication_;
+
+  // The last time the user was successfully authenticated.
+  // Used to determine whether or not to reveal plaintext passwords.
+  base::TimeTicks last_authentication_time_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordManagerHandler);
 };