AsyncHostResolver: integrated HostCache, temporarily, until we have RR cache.

net/base/address_list.cc

 // Copyright (c) 2011 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.
 
 #include "net/base/address_list.h"
 
 #include <stdlib.h>
 
 #include "base/logging.h"
 #include "net/base/net_util.h"
@@ skipping 261 matching lines @@
   struct addrinfo* mutable_head = const_cast<struct addrinfo*>(head);
 
   // Call either freeaddrinfo(head), or FreeMyAddrinfo(head), depending who
   // created the data.
   if (is_system_created)
     freeaddrinfo(mutable_head);
   else
     FreeCopyOfAddrinfo(mutable_head);
 }
 
+AddressList CreateAddressListUsingPort(const AddressList& src, int port) {
+  if (src.GetPort() == port)
+    return src;
+
+  AddressList out = src;
+  out.SetPort(port);
+  return out;
+}
+
 }  // namespace net