Add a command line flag to change the default number of parallel DNS requests...

chrome/service/net/service_url_request_context.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/service/net/service_url_request_context.h"
 
 #include "chrome/service/service_process.h"
 #include "net/base/cookie_monster.h"
 #include "net/base/cookie_policy.h"
 #include "net/base/host_resolver.h"
 #include "net/base/ssl_config_service_defaults.h"
 #include "net/ftp/ftp_network_layer.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_cache.h"
 #include "net/http/http_network_layer.h"
 #include "net/proxy/proxy_service.h"
 
 ServiceURLRequestContextGetter::ServiceURLRequestContextGetter()
     : io_message_loop_proxy_(
           g_service_process->io_thread()->message_loop_proxy()) {
 }
 
 ServiceURLRequestContext::ServiceURLRequestContext() {
-  host_resolver_ = net::CreateSystemHostResolver();
+  host_resolver_ =
+      net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism);
   DCHECK(g_service_process);
   // TODO(sanjeevr): Change CreateSystemProxyConfigService to accept a
   // MessageLoopProxy* instead of MessageLoop*.
   // Also this needs to be created on the UI thread on Linux. Fix this.
   net::ProxyConfigService * proxy_config_service =
       net::ProxyService::CreateSystemProxyConfigService(
           g_service_process->io_thread()->message_loop(),
           g_service_process->file_thread()->message_loop());
   proxy_service_ =
       net::ProxyService::Create(
@@ skipping 13 matching lines @@
   cookie_store_ = new net::CookieMonster(NULL, NULL);
   accept_language_ = "en-us,fr";
   accept_charset_ = "iso-8859-1,*,utf-8";
 }
 
 ServiceURLRequestContext::~ServiceURLRequestContext() {
   delete ftp_transaction_factory_;
   delete http_transaction_factory_;
   delete http_auth_handler_factory_;
 }