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

net/base/net_log_event_type_list.h

Index: net/base/net_log_event_type_list.h
diff --git a/net/base/net_log_event_type_list.h b/net/base/net_log_event_type_list.h
index acb32b5bb2cb8591459c3921abc36bbed69707d5..eadc114137143638efe85635fb004f2438708ceb 100644
--- a/net/base/net_log_event_type_list.h
+++ b/net/base/net_log_event_type_list.h
@@ -173,7 +173,7 @@ EVENT_TYPE(HOST_RESOLVER_IMPL_CREATE_PROC_TASK)
 //
 // On success, the END phase has these parameters:
 //   {
-//     "address_list": <The host name being resolved>,
+//     "address_list": <The resolved addresses>,
 //   }
 // If an error occurred, the END phase will contain these parameters:
 //   {
@@ -182,6 +182,23 @@ EVENT_TYPE(HOST_RESOLVER_IMPL_CREATE_PROC_TASK)
 //   }
 EVENT_TYPE(HOST_RESOLVER_IMPL_PROC_TASK)
 
+// The creation/completion of a HostResolverImpl::DnsTask to manage a
+// DnsTransaction. The BEGIN phase contains the following parameters:
+//
+//   {
+//     "source_dependency": <Source id of DnsTransaction>,
+//   }
+//
+// On success, the END phase has these parameters:
+//   {
+//     "address_list": <The resolved addresses>,
+//   }
+// If an error occurred, the END phase will contain these parameters:
+//   {
+//     "net_error": <The net error code integer for the failure>,
+//   }
+EVENT_TYPE(HOST_RESOLVER_IMPL_DNS_TASK)
+
 // ------------------------------------------------------------------------
 // InitProxyResolver
 // ------------------------------------------------------------------------
@@ -1287,7 +1304,8 @@ EVENT_TYPE(DNS_TRANSACTION_QUERY)
 // It has a single parameter:
 //
 //   {
-//     "socket_source": <Source id of the UDP socket created for the attempt>,
+//     "source_dependency": <Source id of the UDP socket created for the
+//                           attempt>,
 //   }
 EVENT_TYPE(DNS_TRANSACTION_ATTEMPT)
 
@@ -1298,8 +1316,8 @@ EVENT_TYPE(DNS_TRANSACTION_ATTEMPT)
 //   {
 //     "rcode": <rcode in the received response>,
 //     "answer_count": <answer_count in the received response>,
-//     "socket_source": <Source id of the UDP socket that received the
-//                       response>,
+//     "source_dependency": <Source id of the UDP socket that received the
+//                           response>,
 //   }
 EVENT_TYPE(DNS_TRANSACTION_RESPONSE)