Store original request URL in offline page metadata table

components/offline_pages/offline_page_item.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 COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_ITEM_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_ITEM_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 41 matching lines @@
                   int64_t file_size,
                   const base::Time& creation_time);
   OfflinePageItem(const OfflinePageItem& other);
   ~OfflinePageItem();
 
   bool operator==(const OfflinePageItem& other) const;
 
   // Returns whether the offline page is expired.
   bool IsExpired() const;
 
-  // The URL of the page.
+  // The URL of the page. This is the last committed URL. In the case that
+  // redirects occur, access |original_url| for the original URL.
   GURL url;
   // The primary key/ID for this page in offline pages internal database.
   int64_t offline_id;
 
   // The Client ID (external) related to the offline page. This is opaque
   // to our system, but useful for users of offline pages who want to map
   // their ids to our saved pages.
   ClientId client_id;
 
   // The file path to the archive with a local copy of the page.
   base::FilePath file_path;
   // The size of the offline copy.
   int64_t file_size;
   // The time when the offline archive was created.
   base::Time creation_time;
   // The time when the offline archive was last accessed.
   base::Time last_access_time;
   // The time when the offline page was expired.
   base::Time expiration_time;
   // Number of times that the offline archive has been accessed.
   int access_count;
   // The title of the page at the time it was saved.
   base::string16 title;
   // Flags about the state and behavior of the offline page.
   Flags flags;
+  // The original URL of the page if not empty. Otherwise, this is set to empty
+  // and |url| should be accessed instead.
+  GURL original_url;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_ITEM_H_