Avoid doing concurrent DNS resolves of the same hostname

webkit/tools/test_shell/test_shell_request_context.cc

 // Copyright (c) 2006-2008 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 "webkit/tools/test_shell/test_shell_request_context.h"
 
 #include "net/base/cookie_monster.h"
+#include "net/base/host_resolver.h"
 #include "net/proxy/proxy_service.h"
 #include "webkit/glue/webkit_glue.h"
 
 TestShellRequestContext::TestShellRequestContext() {
   Init(std::wstring(), net::HttpCache::NORMAL, false);
 }
 
 TestShellRequestContext::TestShellRequestContext(
     const std::wstring& cache_path,
     net::HttpCache::Mode cache_mode,
@@ skipping 16 matching lines @@
   // Force no_proxy to true so as to use a fixed proxy configuration
   // and bypass ProxyConfigServiceLinux. Enabling use of the
   // ProxyConfigServiceLinux requires:
   // -Calling from a thread with a TYPE_UI MessageLoop,
   // -If at all possible, passing in a pointer to the IO thread's MessageLoop,
   // -Keep in mind that proxy auto configuration is also
   //  non-functional on linux in this context because of v8 threading
   //  issues.
   no_proxy = true;
 #endif
+  host_resolver_ = new net::HostResolver();
   proxy_service_ = net::ProxyService::Create(no_proxy ? &proxy_config : NULL,
                                              false, NULL, NULL);
 
   net::HttpCache *cache;
   if (cache_path.empty()) {
-    cache = new net::HttpCache(proxy_service_, 0);
+    cache = new net::HttpCache(host_resolver_, proxy_service_, 0);
   } else {
-    cache = new net::HttpCache(proxy_service_, cache_path, 0);
+    cache = new net::HttpCache(host_resolver_, proxy_service_, cache_path, 0);
   }
   cache->set_mode(cache_mode);
   http_transaction_factory_ = cache;
 }
 
 TestShellRequestContext::~TestShellRequestContext() {
   delete cookie_store_;
   delete http_transaction_factory_;
   delete proxy_service_;
+  delete host_resolver_;
 }
 
 const std::string& TestShellRequestContext::GetUserAgent(
     const GURL& url) const {
   return webkit_glue::GetUserAgent(url);
 }