HostResolver supports optional CNAME lookups.

net/socket/socket_test_util.cc

Index: net/socket/socket_test_util.cc
diff --git a/net/socket/socket_test_util.cc b/net/socket/socket_test_util.cc
index 4a8311cb6e22dd4a9e48244a30751e75966675d5..587693faaf36d81a44cdb7b24bfdc4c4c016ce48 100644
--- a/net/socket/socket_test_util.cc
+++ b/net/socket/socket_test_util.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -52,6 +52,7 @@ bool MockClientSocket::IsConnectedAndIdle() const {
 
 int MockClientSocket::GetPeerAddress(AddressList* address) const {
   return net::SystemHostResolverProc("localhost", ADDRESS_FAMILY_UNSPECIFIED,
+                                     0,
                                      address);
 }