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

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_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 106 matching lines @@
   // status to them.
   virtual void DestroyPrerenderForRenderView(int process_id, int view_id,
                                              FinalStatus final_status);
 
   // Cancels all active prerenders.
   void CancelAllPrerenders();
 
   // Cancels all active prerenders with the ORIGIN_OMNIBOX origin.
   void CancelOmniboxPrerenders();
 
-  // For a given WebContents that wants to navigate to the URL supplied,
-  // determines whether a prerendered version of the URL can be used,
-  // and substitutes the prerendered RVH into the WebContents. |opener_url| is
-  // set to the window.opener url that the WebContents should have set and
-  // will be empty if there is no opener set. Returns whether or not a
-  // prerendered RVH could be used or not.
+  // If |url| matches a valid prerendered page, try to swap it into
+  // |web_contents| and merge browsing histories. Returns |true| if a
+  // prerendered page is swapped in, |false| otherwise.
   bool MaybeUsePrerenderedPage(content::WebContents* web_contents,
-                               const GURL& url,
-                               const GURL& opener_url);
+                               const GURL& url);
 
   // Moves a PrerenderContents to the pending delete list from the list of
   // active prerenders when prerendering should be cancelled.
   void MoveEntryToPendingDelete(PrerenderContents* entry,
                                 FinalStatus final_status);
 
   // Records the perceived page load time for a page - effectively the time from
   // when the user navigates to a page to when it finishes loading. The actual
   // load may have started prior to navigation due to prerender hints.
   // This must be called on the UI thread.
@@ skipping 301 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 PrerenderManager* FindPrerenderManagerUsingRenderProcessId(
     int render_process_id);
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_