Track original URL when downloading a redirected page

chrome/browser/android/offline_pages/offline_page_utils.h

 // Copyright 2015 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 CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "components/offline_pages/core/offline_page_model.h"
-
-class GURL;
+#include "url/gurl.h"
 
 namespace base {
 class Time;
 }
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
@@ skipping 64 matching lines @@
   static void CheckExistenceOfRequestsWithURL(
       content::BrowserContext* browser_context,
       const std::string name_space,
       const GURL& url,
       const PagesExistCallback& callback);
 
   static bool EqualsIgnoringFragment(const GURL& lhs, const GURL& rhs);
 
   static void StartOfflinePageDownload(content::BrowserContext* context,
                                        const GURL& url);
+
+  // Returns original URL of the given web contents. Empty URL is returned if
+  // no redirect occurred.
+  static GURL GetOriginalURLFromWebContents(content::WebContents* web_contents);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_