Gets virtual page routing working, now just need to document.

src/Umbraco.Web.Common/Routing/CustomRouteContentFinderDelegate.cs

@@ -0,0 +1,15 @@
+using System;
+using Microsoft.AspNetCore.Http;
+using Umbraco.Core.Models.PublishedContent;
+
+namespace Umbraco.Web.Common.Extensions
+{
+    internal class CustomRouteContentFinderDelegate
+    {
+        private readonly Func<HttpContext, IPublishedContent> _findContent;
+
+        public CustomRouteContentFinderDelegate(Func<HttpContext, IPublishedContent> findContent) => _findContent = findContent;
+
+        public IPublishedContent FindContent(HttpContext httpContext) => _findContent(httpContext);
+    }
+}