Add AddCallbackForCookie method to CookieStore.

chrome/browser/prerender/prerender_cookie_store.h

 // Copyright 2014 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_BROWSER_PRERENDER_PRERENDER_COOKIE_STORE_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_COOKIE_STORE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 66 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;
 
   net::CookieMonster* GetCookieMonster() override;
 
+  scoped_ptr<CookieStore::CookieChangedSubscription> AddCallbackForCookie(
+      const GURL& url,
+      const std::string& name,
+      const CookieChangedCallback& callback) override;
+
   // Commits the changes made to the underlying cookie store, and switches
   // into forwarding mode. To be called on the IO thread.
   // |cookie_change_urls| will be populated with all URLs for which cookies
   // were updated.
   void ApplyChanges(std::vector<GURL>* cookie_change_urls);
 
   // Called when a cookie for a URL is changed in the underlying default cookie
   // store. To be called on the IO thread. If the key corresponding to the URL
   // was copied or read, the prerender will be cancelled.
   void OnCookieChangedForURL(net::CookieMonster* cookie_monster,
@@ skipping 54 matching lines @@
 
   // Indicates whether a cookie conflict has been detected yet.
   bool cookie_conflict_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderCookieStore);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_COOKIE_STORE_H_