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

content/browser/tab_contents/tab_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 CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 95 matching lines @@
 
   // Unsets the currently showing interstitial.
   void remove_interstitial_page() {
     render_manager_.remove_interstitial_page();
   }
 
   void set_opener_web_ui_type(content::WebUI::TypeID opener_web_ui_type) {
     opener_web_ui_type_ = opener_web_ui_type;
   }
 
+  void set_opener_origin(const GURL& opener_origin) {
+    opener_origin_ = opener_origin;
+  }
+
   JavaBridgeDispatcherHostManager* java_bridge_dispatcher_host_manager() const {
     return java_bridge_dispatcher_host_manager_.get();
   }
 
   // Like GetController from WebContents, but returns the concrete object.
   NavigationControllerImpl& GetControllerImpl();
 
   // Expose the render manager for testing.
   RenderViewHostManager* GetRenderManagerForTesting();
 
@@ skipping 80 matching lines @@
   virtual void ViewSource() OVERRIDE;
   virtual void ViewFrameSource(const GURL& url,
                                const std::string& content_state) OVERRIDE;
   virtual int GetMinimumZoomPercent() const OVERRIDE;
   virtual int GetMaximumZoomPercent() const OVERRIDE;
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual int GetContentRestrictions() const OVERRIDE;
   virtual content::WebUI::TypeID GetWebUITypeForCurrentState() OVERRIDE;
   virtual content::WebUI* GetWebUIForCurrentState() OVERRIDE;
   virtual bool GotResponseToLockMouseRequest(bool allowed) OVERRIDE;
+  virtual const GURL& GetOpenerOrigin() const OVERRIDE;
 
   // Implementation of PageNavigator.
   virtual content::WebContents* OpenURL(
       const content::OpenURLParams& params) OVERRIDE;
 
   // RenderViewHostDelegate ----------------------------------------------------
 
   virtual content::RenderViewHostDelegate::View* GetViewDelegate() OVERRIDE;
   virtual content::RenderViewHostDelegate::RendererManagement*
       GetRendererManagementDelegate() OVERRIDE;
@@ skipping 416 matching lines @@
   // The intrinsic size of the page.
   gfx::Size preferred_size_;
 
   // Content restrictions, used to disable print/copy etc based on content's
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   // Our view type. Default is VIEW_TYPE_TAB_CONTENTS.
   content::ViewType view_type_;
 
+  // The origin of the opener.

[Charlie Reis, 2012/03/01 19:06:03]

I don't quite follow this.  The origin of the opener can change if it navigates.
 How long is this valid?  If you only care about it for the initial value, maybe
we should be clearer in the name, like initial_opener_origin_ (though I'm not
sure what that's useful for).

[cbentzel, 2012/03/01 22:18:53]

I thought opener was associated with a browsing context, rather than an
individual navigation within the context?

This is probably incorrect either way. I'll rethink how to do this.

[Charlie Reis, 2012/03/01 22:24:38]

Correct.  The opener is a browser context, like a tab or a frame.  It stays
valid as the page within it (and thus the origin) changes.  That's why I don't
think it makes sense to remember the origin of the opener's current page.

+  GURL opener_origin_;
+
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_