[net] HostResolverImpl + DnsTransaction + DnsConfigService = Asynchronous DNS ready for experiments.

net/dns/dns_response.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_DNS_DNS_RESPONSE_H_
 #define NET_DNS_DNS_RESPONSE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/string_piece.h"
+#include "base/time.h"
 #include "net/base/net_export.h"
 #include "net/base/net_util.h"
 
 namespace net {
 
+class AddressList;
 class DnsQuery;
 class IOBufferWithSize;
 
 namespace dns_protocol {
 struct Header;
 }
 
 // Parsed resource record.
 struct NET_EXPORT_PRIVATE DnsResourceRecord {
   DnsResourceRecord();
@@ skipping 94 matching lines @@
   // Buffer into which response bytes are read.
   scoped_refptr<IOBufferWithSize> io_buffer_;
 
   // Iterator constructed after InitParse positioned at the answer section.
   // It is never updated afterwards, so can be used in accessors.
   DnsRecordParser parser_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsResponse);
 };
 
+// Extracts an AddressList from a DnsResponse. Returns true if succeeded.
+bool DnsResponseToAddressList(const DnsResponse* response,
+                              AddressList* addr_list,
+                              base::TimeDelta* ttl);
+
 }  // namespace net
 
 #endif  // NET_DNS_DNS_RESPONSE_H_