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

net/base/net_log_event_type_list.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.
 
 // NOTE: No header guards are used, since this file is intended to be expanded
 // directly into net_log.h. DO NOT include this file anywhere else.
 
 // In the event of a failure, a many end events will have a |net_error|
 // parameter with the integer error code associated with the failure.  Most
 // of these parameters are not individually documented.
@@ skipping 1269 matching lines @@
 //   "net_error": <The net error code for the failure, if any>,
 // }
 EVENT_TYPE(DNS_TRANSACTION_QUERY)
 
 // This event is created when DnsTransaction creates a new UDP socket and
 // tries to resolve the fully-qualified name.
 //
 // 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)
 
 // This event is created when DnsTransaction receives a matching response.
 //
 // It has the following parameters:
 //
 //   {
 //     "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)
 
 // ------------------------------------------------------------------------
 // AsyncHostResolver
 // ------------------------------------------------------------------------
 
 // The start/end of waiting on a host resolve (DNS) request.
 // The BEGIN phase contains the following parameters:
 //
@@ skipping 322 matching lines @@
 // This may occur even when the file is not open.
 EVENT_TYPE(FILE_STREAM_CLOSE)
 
 // This event is created when a file stream operation has an error.
 //   {
 //     "operation": <open, write, close, etc>,
 //     "os_error": <OS-dependent error code>,
 //     "net_error": <net::Error code>,
 //   }
 EVENT_TYPE(FILE_STREAM_ERROR)