DnsClient refactoring + features (timeout, suffix search, server rotation).

net/dns/dns_protocol.h

Index: net/dns/dns_protocol.h
diff --git a/net/dns/dns_protocol.h b/net/dns/dns_protocol.h
index 494429bde1dfc288e600046364f0b540728a7754..53998fc57ced3008610de824fc936ac82bb4d25d 100644
--- a/net/dns/dns_protocol.h
+++ b/net/dns/dns_protocol.h
@@ -75,7 +75,7 @@ namespace dns_protocol {
 // Used internally in DnsQuery and DnsResponseParser.
 struct NET_EXPORT_PRIVATE Header {
   uint16 id;
-  uint8 flags[2];
+  uint16 flags;
   uint16 qdcount;
   uint16 ancount;
   uint16 nscount;
@@ -114,6 +114,10 @@ static const uint8 kRcodeNXDOMAIN = 3;
 static const uint8 kRcodeNOTIMP = 4;
 static const uint8 kRcodeREFUSED = 5;
 
+// DNS flags.
+static const uint16 kFlagRD = 0x100;
+static const uint16 kFlagTC = 0x200;
+
 }  // namespace dns_protocol
 
 }  // namespace net