Improve unit testing of socket API.

chrome/test/base/browser_with_test_window_test.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.
 
 #ifndef CHROME_TEST_BASE_BROWSER_WITH_TEST_WINDOW_TEST_H_
 #define CHROME_TEST_BASE_BROWSER_WITH_TEST_WINDOW_TEST_H_
 
 #include "base/message_loop.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/test_browser_window.h"
@@ skipping 93 matching lines @@
   // Creates the profile used by this test. The caller owns the return value.
   virtual TestingProfile* CreateProfile();
 
  private:
   // We need to create a MessageLoop, otherwise a bunch of things fails.
   MessageLoopForUI ui_loop_;
   content::TestBrowserThread ui_thread_;
   content::TestBrowserThread db_thread_;
   content::TestBrowserThread file_thread_;
   content::TestBrowserThread file_user_blocking_thread_;
+  content::TestBrowserThread io_thread_;
 
   scoped_ptr<TestingProfile> profile_;
   scoped_ptr<TestBrowserWindow> window_;
   scoped_ptr<Browser> browser_;
 
   // The existence of this object enables tests via
   // RenderViewHostTester.
   content::RenderViewHostTestEnabler rvh_test_enabler_;
 
 #if defined(USE_AURA)
   scoped_ptr<aura::test::AuraTestHelper> aura_test_helper_;
 #endif
 
 #if defined(OS_WIN)
   ui::ScopedOleInitializer ole_initializer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BrowserWithTestWindowTest);
 };
 
 #endif  // CHROME_TEST_BASE_BROWSER_WITH_TEST_WINDOW_TEST_H_