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

net/dns/dns_response.h

Index: net/dns/dns_response.h
diff --git a/net/dns/dns_response.h b/net/dns/dns_response.h
index 764517a37047354dd2fd9fbd8e6c57e4b0e41294..1f55e374ddf1364d1e826cdc7d4ac028700fc154 100644
--- a/net/dns/dns_response.h
+++ b/net/dns/dns_response.h
@@ -11,11 +11,13 @@
 #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;
 
@@ -116,6 +118,9 @@ class NET_EXPORT_PRIVATE DnsResponse {
   // This operation is idempotent.
   DnsRecordParser Parser() const;
 
+  // Extracts an AddressList from this response. Returns true if succeeded.
+  bool ParseAddressList(AddressList* addr_list, base::TimeDelta* ttl) const;

[mmenke, 2012/02/14 18:46:00]

nit:  Suggest you rename this function to ParseAddresses or AsAddressList or
CreateAddressList or something.  Want to make it clearer from its name that it
is not parsing the AddressList that's an argument, but it's parsing its contents
as an address.

+
  private:
   // Convenience for header access.
   const dns_protocol::Header* header() const;