public class SampleWidgetController : Controller
{
    public ActionResult Content()
    {
        ...
    }
}

public class CommonController : Controller
{
    public ActionResult Content(string controllerName, string actionName)
    {
        // I want all requests to SampleWidget/Content to be passed here
        // With controllerName = "SampleWidget" and actionName = "Content"
    }
}