Add AddCallbackForCookie method to CookieStore.

net/cookies/cookie_store_test_helpers.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 NET_COOKIES_COOKIE_STORE_TEST_HELPERS_H_
 #define NET_COOKIES_COOKIE_STORE_TEST_HELPERS_H_
 
 #include "net/cookies/cookie_monster.h"
 
 #include <string>
@@ skipping 47 matching lines @@
   void DeleteAllCreatedBetweenForHostAsync(
       const base::Time delete_begin,
       const base::Time delete_end,
       const GURL& url,
       const DeleteCallback& callback) override;
 
   void DeleteSessionCookiesAsync(const DeleteCallback&) override;
 
   CookieMonster* GetCookieMonster() override;
 
+  scoped_ptr<CookieStore::CookieChangedSubscription>
+  AddCallbackForCookie(const GURL& url, const std::string& name,
+                       const CookieChangedCallback& callback) override;
+
  private:
 
   // Be called immediately from CookieMonster.
 
   void SetCookiesInternalCallback(bool result);
 
   void GetCookiesWithOptionsInternalCallback(const std::string& cookie);
 
   // Invoke the original callbacks.
 
@@ skipping 10 matching lines @@
 
   bool did_run_;
   bool result_;
   std::string cookie_;
   std::string cookie_line_;
 };
 
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_STORE_TEST_HELPERS_H_