Adds routed interface support between RenderFrameHost and RenderFrame

content/public/common/routed_interface.mojom

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module content.mojom;
+
+// A generic, nominal interface to support the transitional interfaces below.
+interface RoutedInterface {};
+
+// Implemented by either side of a single route to bind associated interface
+// requests from the other side.
+interface RoutedInterfaceProvider {
+  GetRoutedInterface(string name, associated RoutedInterface& request);
+};
+
+// Implemented by anything which manages one or more routes, to map a routing
+// ID to an interface provider.
+interface RouteProvider {
+  GetRoutedInterfaces(int32 routing_id,
+                      associated RoutedInterfaceProvider& request);
+};