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

content/browser/tab_contents/tab_contents_view_helper.cc

 // 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.
 
 #include "content/browser/tab_contents/tab_contents_view_helper.h"
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/common/view_messages.h"
 #include "content/port/browser/render_widget_host_view_port.h"
@@ skipping 63 matching lines @@
   // Create the new web contents. This will automatically create the new
   // WebContentsView. In the future, we may want to create the view separately.
   TabContents* new_contents =
       new TabContents(web_contents->GetBrowserContext(),
                       site_instance,
                       route_id,
                       static_cast<TabContents*>(web_contents),
                       NULL);
   new_contents->set_opener_web_ui_type(
       web_contents->GetWebUITypeForCurrentState());
+  new_contents->set_has_opener(!params.opener_url.is_empty());
 
   if (params.opener_suppressed) {
     // When the opener is suppressed, the original renderer cannot access the
     // new window.  As a result, we need to show and navigate the window here.
     gfx::Rect initial_pos;
     web_contents->AddNewContents(new_contents,
                                  params.disposition,
                                  initial_pos,
                                  params.user_gesture);
     content::OpenURLParams open_params(params.target_url, content::Referrer(),
@@ skipping 111 matching lines @@
       RenderWidgetHostViewPort::FromRWHV(GetCreatedWidget(route_id));
   if (is_fullscreen) {
     widget_host_view->InitAsFullscreen(web_contents->GetRenderWidgetHostView());
   } else {
     widget_host_view->InitAsPopup(web_contents->GetRenderWidgetHostView(),
                                   initial_pos);
   }
   RenderWidgetHostImpl::From(widget_host_view->GetRenderWidgetHost())->Init();
   return widget_host_view;
 }