Fixing that the new HttpAsyncHandler didn't expose the RequestContext, causing injected RequestContext objects to be empty

src/Orchard/Mvc/Routes/ShellRoute.cs

@@ -145,7 +145,7 @@ namespace Orchard.Mvc.Routes {
             }
         }
 
-        class HttpAsyncHandler : HttpTaskAsyncHandler, IRequiresSessionState {
+        class HttpAsyncHandler : HttpTaskAsyncHandler, IRequiresSessionState, IHasRequestContext {
             private readonly IWorkContextAccessor _workContextAccessor;
             private readonly IHttpAsyncHandler _httpAsyncHandler;
             private readonly Func<IDictionary<string, object>, Task> _pipeline;
@@ -181,6 +181,13 @@ namespace Orchard.Mvc.Routes {
                     await _pipeline.Invoke(environment);
                 }
             }
+
+            public RequestContext RequestContext {
+                get {
+                    var mvcHandler = _httpAsyncHandler as MvcHandler;
+                    return mvcHandler == null ? null : mvcHandler.RequestContext;
+                }
+            }
         }
     }
 }