Fix a bug where redirect chain gets lost on process swap.

content/browser/tab_contents/page_navigator.h

 // Copyright (c) 2011 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.
 
 // PageNavigator defines an interface that can be used to express the user's
 // intention to navigate to a particular URL.  The implementing class should
 // perform the navigation.
 
 #ifndef CONTENT_BROWSER_TAB_CONTENTS_PAGE_NAVIGATOR_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_PAGE_NAVIGATOR_H_
 #pragma once
 
 #include <string>
 
+#include "content/browser/renderer_host/global_request_id.h"
 #include "content/common/content_export.h"
 #include "content/public/common/page_transition_types.h"
 #include "googleurl/src/gurl.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class TabContents;
 
 struct CONTENT_EXPORT OpenURLParams {
   OpenURLParams(const GURL& url,
                 const GURL& referrer,
                 WindowOpenDisposition disposition,
                 content::PageTransition transition,
                 bool is_renderer_initiated);
   ~OpenURLParams();
-class TabContents;
 
   // The URL/referrer to be opened.
   GURL url;
   GURL referrer;
 
   // The disposition requested by the navigation source.
   WindowOpenDisposition disposition;
 
   // The transition type of navigation.
   content::PageTransition transition;
 
   // Whether this navigation is initiated by the renderer process.
   bool is_renderer_initiated;
 
   // The override encoding of the URL contents to be opened.
   std::string override_encoding;
 
+  // Reference to the old request id in case this is a navigation that is being
+  // transferred to a new renderer.
+  GlobalRequestID transferred_global_request_id;
+
  private:
   OpenURLParams();
 };
 
 class CONTENT_EXPORT PageNavigator {
  public:
   // Deprecated. Please use the one-argument variant instead.
   // TODO(adriansc): Remove this method when refactoring changed all call sites.
   virtual TabContents* OpenURL(const GURL& url,
                                const GURL& referrer,
                                WindowOpenDisposition disposition,
                                content::PageTransition transition) = 0;
 
   // Opens a URL with the given disposition.  The transition specifies how this
   // navigation should be recorded in the history system (for example, typed).
   // Returns the TabContents the URL is opened in, or NULL if the URL wasn't
   // opened immediately.
   virtual TabContents* OpenURL(const OpenURLParams& params) = 0;
 
  protected:
   virtual ~PageNavigator() {}
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_PAGE_NAVIGATOR_H_