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

chrome/browser/resources/net_internals/events_view.css

 /**
  * 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.
  */
 
 #events-view-filter-box {
   background: #efefef;
   padding: 5px;
   border-bottom: 1px solid gray;
@@ skipping 55 matching lines @@
 
 #events-view-source-list-tbody .inactive {
   background: #F5FFF5;
 }
 
 #events-view-source-list-tbody .source_CONNECT_JOB {
   color: blue;
 }
 
 #events-view-source-list-tbody .source_HOST_RESOLVER_IMPL_JOB,
-#events-view-source-list-tbody .source_HOST_RESOLVER_IMPL_REQUEST,
-#events-view-source-list-tbody .source_HOST_RESOLVER_IMPL_PROC_TASK,
-#events-view-source-list-tbody .source_ASYNC_HOST_RESOLVER_REQUEST,
-#events-view-source-list-tbody .source_DNS_TRANSACTION {
+#events-view-source-list-tbody .source_HOST_RESOLVER_IMPL_REQUEST {
   color: #206060;
 }
 
 #events-view-source-list-tbody .source_DISK_CACHE_ENTRY,
 #events-view-source-list-tbody .source_MEMORY_CACHE_ENTRY {
   color: #707070;
 }
 
 #events-view-source-list-tbody .source_SOCKET {
   color: purple;
@@ skipping 11 matching lines @@
   color: #707000;
 }
 
 #events-view-source-list-tbody .source_FILESTREAM {
   color: #700070;
 }
 
 #events-view-source-list-tbody .source_NONE {
   color: red;
 }