Load offline page if reading list entry takes more than 1s to load.

ios/web/public/navigation_manager.h

 // Copyright 2013 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 IOS_WEB_PUBLIC_NAVIGATION_MANAGER_H_
 #define IOS_WEB_PUBLIC_NAVIGATION_MANAGER_H_
 
 #include <stddef.h>
 
 #import "base/mac/scoped_nsobject.h"
@@ skipping 30 matching lines @@
     // The transition type for the load. Defaults to PAGE_TRANSITION_LINK.
     ui::PageTransition transition_type;
 
     // True for renderer-initiated navigations. This is
     // important for tracking whether to display pending URLs.
     bool is_renderer_initiated;
 
     // Any extra HTTP headers to add to the load.
     base::scoped_nsobject<NSDictionary> extra_headers;
 
+    base::scoped_nsobject<NSDictionary> extra_data;
+
     // Any post data to send with the load. When setting this, you should
     // generally set a Content-Type header as well.
     base::scoped_nsobject<NSData> post_data;
 
     // Create a new WebLoadParams with the given URL and defaults for all other
     // parameters.
     explicit WebLoadParams(const GURL& url);
     ~WebLoadParams();
 
     // Allow copying WebLoadParams.
@@ skipping 81 matching lines @@
   // Reloads the current entry. If |check_for_repost| is true and the current
   // entry has POST data the user is prompted to see if they really want to
   // reload the page. In nearly all cases pass in true.  If a transient entry
   // is showing, initiates a new navigation to its URL.
   virtual void Reload(bool check_for_repost) = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_NAVIGATION_MANAGER_H_