Add a basic functionality to the force-saving menu item.

components/password_manager/core/browser/password_manager.h

Index: components/password_manager/core/browser/password_manager.h
diff --git a/components/password_manager/core/browser/password_manager.h b/components/password_manager/core/browser/password_manager.h
index bc0d628f8ba212b373391f9c7c9cd19475f34e4c..48b198f214860138d90df2a48768e2c18b45e90d 100644
--- a/components/password_manager/core/browser/password_manager.h
+++ b/components/password_manager/core/browser/password_manager.h
@@ -103,6 +103,11 @@ class PasswordManager : public LoginModel {
       password_manager::PasswordManagerDriver* driver,
       const autofill::PasswordForm& password_form);
 
+  // Handles a manual request to save password.
+  void OnPasswordFormForceSaveRequested(
+      password_manager::PasswordManagerDriver* driver,
+      const autofill::PasswordForm& password_form);
+
   // Called if |password_form| was filled upon in-page navigation. This often
   // means history.pushState being called from JavaScript. If this causes false
   // positive in password saving, update http://crbug.com/357696.