[Media Router] Add a supports_web_ui_controller attribute to MediaRoute

chrome/common/media_router/mojo/media_router_struct_traits.h

Index: chrome/common/media_router/mojo/media_router_struct_traits.h
diff --git a/chrome/common/media_router/mojo/media_router_struct_traits.h b/chrome/common/media_router/mojo/media_router_struct_traits.h
index 7f98146ff2c154e0244e7a2ec7bb96012c3c89d5..06f0940d3e81a497518100ceb39e4a85d328152f 100644
--- a/chrome/common/media_router/mojo/media_router_struct_traits.h
+++ b/chrome/common/media_router/mojo/media_router_struct_traits.h
@@ -385,6 +385,11 @@ struct StructTraits<media_router::mojom::MediaRouteDataView,
                : base::make_optional(route.custom_controller_path());
   }
 
+  static bool supports_media_route_controller(
+      const media_router::MediaRoute& route) {
+    return route.supports_media_route_controller();
+  }
+
   static bool for_display(const media_router::MediaRoute& route) {
     return route.for_display();
   }