Only commit cookie changes in prerenders after a prerender is shown

net/cookies/cookie_monster.h

Index: net/cookies/cookie_monster.h
===================================================================
--- net/cookies/cookie_monster.h	(revision 265252)
+++ net/cookies/cookie_monster.h	(working copy)
@@ -307,6 +307,19 @@
   static const char* kDefaultCookieableSchemes[];
   static const int kDefaultCookieableSchemesCount;
 
+  // Copies all keys for the given |key| to another cookie monster |other|.
+  // Both |other| and |this| must be loaded for this operation to succeed.
+  // Furthermore, there may not be any cookies stored in |other| for |key|.
+  // Returns false if any of these conditions is not met.
+  bool CopyCookiesForKeyToOtherCookieMonster(std::string key,
+                                             CookieMonster* other);
+
+  // Find the key (for lookup in cookies_) based on the given domain.
+  // See comment on keys before the CookieMap typedef.
+  std::string GetKey(const std::string& domain) const;
+
+  bool loaded();
+
  private:
   // For queueing the cookie monster calls.
   class CookieMonsterTask;
@@ -455,6 +468,7 @@
         InitStore();
       } else {
         loaded_ = true;
+        ReportLoaded();
       }
       initialized_ = true;
     }
@@ -464,6 +478,9 @@
   // Should only be called by InitIfNecessary().
   void InitStore();
 
+  // Reports to the delegate that the cookie monster was loaded.
+  void ReportLoaded();
+
   // Stores cookies loaded from the backing store and invokes any deferred
   // calls. |beginning_time| should be the moment PersistentCookieStore::Load
   // was invoked and is used for reporting histogram_time_blocked_on_load_.
@@ -576,10 +593,6 @@
                                 CookieItVector::iterator cookie_its_begin,
                                 CookieItVector::iterator cookie_its_end);
 
-  // Find the key (for lookup in cookies_) based on the given domain.
-  // See comment on keys before the CookieMap typedef.
-  std::string GetKey(const std::string& domain) const;
-
   bool HasCookieableScheme(const GURL& url);
 
   // Statistics support
@@ -720,6 +733,9 @@
   virtual void OnCookieChanged(const CanonicalCookie& cookie,
                                bool removed,
                                ChangeCause cause) = 0;
+  // Indicates that the cookie store has fully loaded.
+  virtual void OnLoaded() = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<CookieMonsterDelegate>;
   virtual ~CookieMonsterDelegate() {}