Add host_resolver.mojom and update network_service.mojom

mojo/services/network/public/interfaces/network_service.mojom

 // Copyright 2014 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 mojo;
 
 import "mojo/public/interfaces/network/network_error.mojom";
 import "network/public/interfaces/cookie_store.mojom";
+import "network/public/interfaces/host_resolver.mojom";
 import "network/public/interfaces/http_server.mojom";
 import "network/public/interfaces/net_address.mojom";
 import "network/public/interfaces/tcp_bound_socket.mojom";
 import "network/public/interfaces/tcp_connected_socket.mojom";
 import "network/public/interfaces/udp_socket.mojom";
 import "network/public/interfaces/url_loader.mojom";
 import "network/public/interfaces/url_loader_interceptor.mojom";
 import "network/public/interfaces/web_socket.mojom";
 
 // TODO Darin suggests that this should probably be two classes. One for
@@ skipping 49 matching lines @@
   // pick an available port for the given address, or it can pass 0 for the
   // address and port for the OS to pick both the local address and port. In
   // all success cases, the resulting local address will be passed to the
   // callback as bound_to.
   CreateHttpServer(NetAddress local_address,
                    HttpServerDelegate delegate)
       => (NetworkError result,
           NetAddress? bound_to);
 
   // Register a new url loader interceptor that will be used on any new
-  // URLLoader. Interceptor are chained. The last registed interceptor will
-  // received the requests first and the responses last.
+  // URLLoader created with the current connection to the network service.
+  // Interceptors are chained. The last registered interceptor will received the
+  // requests first and the responses last.
   RegisterURLLoaderInterceptor(URLLoaderInterceptorFactory factory);
+
+  // Create a HostResolver that can be used to do ip <-> host lookups.
+  CreateHostResolver(HostResolver& host_resolver);
 };