Prerendered pages are swapped in at browser::Navigate time.

chrome/browser/prerender/prerender_contents.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_CONTENTS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 321 matching lines @@
 
   // Origin for this prerender.
   Origin origin_;
 
   // Experiment during which this prerender is performed.
   uint8 experiment_id_;
 
   // List of all pages the prerendered page has tried to prerender.
   PendingPrerenderList pending_prerender_list_;
 
+  // The process that created the child id.
+  int creator_child_id_;
+
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_