Create a secondary file thread, FILE_USER_BLOCKING...

chrome/test/base/testing_browser_process.cc

 // Copyright (c) 2011 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/test/base/testing_browser_process.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/google/google_url_tracker.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
 #include "chrome/browser/policy/browser_policy_connector.h"
@@ skipping 38 matching lines @@
 }
 
 base::Thread* TestingBrowserProcess::db_thread() {
   return NULL;
 }
 
 base::Thread* TestingBrowserProcess::cache_thread() {
   return NULL;
 }
 
+base::Thread* TestingBrowserProcess::appcache_thread() {
+  return NULL;
+}
+
 WatchDogThread* TestingBrowserProcess::watchdog_thread() {
   return NULL;
 }
 
 #if defined(OS_CHROMEOS)
 base::Thread* TestingBrowserProcess::web_socket_proxy_thread() {
   return NULL;
 }
 #endif
 
@@ skipping 203 matching lines @@
   google_url_tracker_.reset(google_url_tracker);
 }
 
 void TestingBrowserProcess::SetIOThread(IOThread* io_thread) {
   io_thread_ = io_thread;
 }
 
 void TestingBrowserProcess::SetDevToolsManager(DevToolsManager* manager) {
   devtools_manager_.reset(manager);
 }