--- /dev/null
+<?php
+
+namespace Drupal\Core\Routing;
+
+use Symfony\Component\Routing\Matcher\Dumper\MatcherDumperInterface as SymfonyMatcherDumperInterface;
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * Extends the symfony matcher dumper interface with a addRoutes method.
+ */
+interface MatcherDumperInterface extends SymfonyMatcherDumperInterface {
+
+ /**
+ * Adds additional routes to be dumped.
+ *
+ * @param \Symfony\Component\Routing\RouteCollection $routes
+ * A collection of routes to add to this dumper.
+ */
+ public function addRoutes(RouteCollection $routes);
+
+}