Add GetOriginalRequestURL() to NavigationItem interface.

ios/web/public/navigation_item.h

 // Copyright 2014 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_ITEM_H_
 #define IOS_WEB_PUBLIC_NAVIGATION_ITEM_H_
 
 #include <memory>
 
 #include "base/strings/string16.h"
@@ skipping 20 matching lines @@
   static std::unique_ptr<NavigationItem> Create();
 
   // Page-related stuff --------------------------------------------------------
 
   // A unique ID is preserved across commits and redirects, which means that
   // sometimes a NavigationEntry's unique ID needs to be set (e.g. when
   // creating a committed entry to correspond to a to-be-deleted pending entry,
   // the pending entry's ID must be copied).
   virtual int GetUniqueID() const = 0;
 
+  // The original URL for the navigation request.  This may differ from GetURL()
+  // if a redirect occurs after attempting to load this original URL.
+  virtual void SetOriginalRequestURL(const GURL& url) = 0;
+  virtual const GURL& GetOriginalRequestURL() const = 0;
+
   // The actual URL of the page. For some about pages, this may be a scary
   // data: URL or something like that. Use GetVirtualURL() below for showing to
   // the user.
   virtual void SetURL(const GURL& url) = 0;
   virtual const GURL& GetURL() const = 0;
 
   // The referring URL. Can be empty.
   virtual void SetReferrer(const Referrer& referrer) = 0;
   virtual const Referrer& GetReferrer() const = 0;
 
@@ skipping 64 matching lines @@
   virtual NSDictionary* GetHttpRequestHeaders() const = 0;
 
   // Adds headers from |additional_headers| to the item's http request headers.
   // Existing headers with the same key will be overridden.
   virtual void AddHttpRequestHeaders(NSDictionary* additional_headers) = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_NAVIGATION_ITEM_H_