Make offline directory name public.

ios/chrome/browser/reading_list/url_downloader.h

 // Copyright 2016 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_CHROME_BROWSER_READING_LIST_URL_DOWNLOADER_H_
 #define IOS_CHROME_BROWSER_READING_LIST_URL_DOWNLOADER_H_
 
 #include <queue>
 
 #include "base/callback.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "ios/chrome/browser/dom_distiller/distiller_viewer.h"
 
 class PrefService;
 class GURL;
 namespace base {
 class FilePath;
 }
 
 namespace dom_distiller {
 class DomDistillerService;
 }
 
+// This string contains the directory name in which offline pages are saved.
+// The directory is located in the profile directory.
+extern const char kReadingListOfflineDirectory[];
+
 // This class downloads and deletes offline versions of URLs using DOM distiller
 // to fetch the page and simplify it. Only one item is downloaded or deleted at
 // a time using a queue of tasks that are handled sequentially. Items (page +
 // images) are saved to individual folders within an offline folder, using md5
 // hashing to create unique file names. When a deletion is requested, all
 // previous downloads for that URL are cancelled as they would be deleted.
 class URLDownloader {
   friend class MockURLDownloader;
 
  public:
@@ skipping 109 matching lines @@
   std::deque<Task> tasks_;
   bool working_;
   base::FilePath base_directory_;
   std::unique_ptr<dom_distiller::DistillerViewerInterface> distiller_;
   base::CancelableTaskTracker task_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(URLDownloader);
 };
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_URL_DOWNLOADER_H_