ApplicationOAuthProvider integrated with ASP.Net membership

I have an extensive Web site written using MVC 4 and using ASP.Net membership for authentication (aspnet_Membership, aspnet_Users tables etc.).

I want to add on a gateway for mobile apps that use OAuth tokens as implemented in Visual Studio 2013 / MVC 5 using the OAuth support when using the Web API controller.

This will be a separate site but I want to access the user credentials in the ASP.Net membership tables.

The ApplicationOAuthProvider uses the new ASP.Net Identity framework.

Is there any way I can make the GrantResourceOwnerCredentials use the old the ASP.Net membership framework ?