Added DnsQuery class

net/base/net_error_list.h

Index: net/base/net_error_list.h
diff --git a/net/base/net_error_list.h b/net/base/net_error_list.h
index 19e5da0de161a6b38203d6efabe73d82dc5dfeb4..9edc9cee41f68f1c1feffd7ce429eb3160c231fa 100644
--- a/net/base/net_error_list.h
+++ b/net/base/net_error_list.h
@@ -231,6 +231,23 @@ NET_ERROR(SSL_CLIENT_AUTH_SIGNATURE_FAILED, -141)
 // which exceeds size threshold).
 NET_ERROR(MSG_TOO_BIG, -142)
 
+// DNS resolver received a malformed response.
+NET_ERROR(DNS_MALFORMED_RESPONSE, -143)
+
+// DNS server requires TCP
+NET_ERROR(DNS_SERVER_REQUIRES_TCP, -144)
+
+// DNS server failed.  This error is returned for all of the following
+// error conditions:
+// 1 - Format error - The name server was unable to interpret the query.
+// 2 - Server failure - The name server was unable to process this query
+//     due to a problem with the name server.
+// 4 - Not Implemented - The name server does not support the requested
+//     kind of query.
+// 5 - Refused - The name server refuses to perform the specified
+//     operation for policy reasons.
+NET_ERROR(DNS_SERVER_FAILED, -145)
+
 // Certificate error codes
 //
 // The values of certificate error codes must be consecutive.