How to extend OWIN Cookie before expiry?

Question

I'm trying to handle ASP.net MVC 5, timeout session scenario. Here is my code I'm using which is working as well for session expiry.

app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            ExpireTimeSpan = 200,
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
            LoginPath = new PathString("/Home/Index"),
            SlidingExpiration=true,
            Provider = new CookieAuthenticationProvider
            {
                OnValidateIdentity = ApplicationCookieIdentityValidator.OnValidateIdentity(
                    validateInterval: TimeSpan.FromMinutes(1),
                    regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
            }
        });

I have to extend/override this expiry whenever user is shown a popup for the expiry of the session. Is there any workaround of overriding or extending the timeout just before it's actual expiry. I need a solution which can be integrated across all the application, Maybe 1 ajax centralized call to server to do that or any other options if there is any?

Thanks.