Add a field trial to disable deferred committing of cookie changes

chrome/browser/prerender/prerender_manager.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_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 350 matching lines @@
   void RecordNetworkBytes(Origin origin, bool used, int64 prerender_bytes);
 
   // Add to the running tally of bytes transferred over the network for this
   // profile if prerendering is currently enabled.
   void AddProfileNetworkBytesIfEnabled(int64 bytes);
 
   // Registers a new ProcessHost performing a prerender. Called by
   // PrerenderContents.
   void AddPrerenderProcessHost(content::RenderProcessHost* process_host);
 
-  bool IsProcessPrerendering(content::RenderProcessHost* process_host);
+  // Returns whether or not |process_host| may be reused for new navigations
+  // from a prerendering perspective. Currently, if Prerender Cookie Stores are
+  // enabled, prerenders must be in their own processes that may not be shared.
+  bool MayReuseProcessHost(content::RenderProcessHost* process_host);
 
   // content::RenderProcessHostObserver implementation.
   virtual void RenderProcessHostDestroyed(
       content::RenderProcessHost* host) OVERRIDE;
 
   // To be called once the cookie store for this profile has been loaded.
   void OnCookieStoreLoaded();
 
   // For testing purposes. Issues a callback once the cookie store has been
   // loaded.
@@ skipping 374 matching lines @@
   bool cookie_store_loaded_;
 
   base::Closure on_cookie_store_loaded_cb_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_