Only commit cookie changes in prerenders after a prerender is shown

content/public/browser/content_browser_client.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 CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 224 matching lines @@
 
   // Returns whether a URL should be allowed to open from a specific context.
   // This also applies in cases where the new URL will open in another process.
   virtual bool ShouldAllowOpenURL(SiteInstance* site_instance, const GURL& url);
 
   // Returns whether a new view for a given |site_url| can be launched in a
   // given |process_host|.
   virtual bool IsSuitableHost(RenderProcessHost* process_host,
                               const GURL& site_url);
 
+  // Returns whether a new view for a new site instance can be added to a
+  // given |process_host|.
+  virtual bool MayReuseHost(RenderProcessHost* process_host);
+
   // Returns whether a new process should be created or an existing one should
   // be reused based on the URL we want to load. This should return false,
   // unless there is a good reason otherwise.
   virtual bool ShouldTryToUseExistingProcessHost(
       BrowserContext* browser_context, const GURL& url);
 
   // Called when a site instance is first associated with a process.
   virtual void SiteInstanceGotProcess(SiteInstance* site_instance) {}
 
   // Called from a site instance's destructor.
@@ skipping 377 matching lines @@
       content::BrowserContext* browser_context,
       const GURL& url);
 
   // Returns true if dev channel APIs are available for plugins.
   virtual bool IsPluginAllowedToUseDevChannelAPIs();
 
   // Returns a special cookie store to use for a given render process, or NULL
   // if the default cookie store should be used
   // This is called on the IO thread.
   virtual net::CookieStore* OverrideCookieStoreForRenderProcess(
-      int render_process_id_);
+      int render_process_id);
 
 #if defined(VIDEO_HOLE)
   // Allows an embedder to provide its own ExternalVideoSurfaceContainer
   // implementation.  Return NULL to disable external surface video.
   virtual ExternalVideoSurfaceContainer*
   OverrideCreateExternalVideoSurfaceContainer(WebContents* web_contents);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_