Preliminary work on resuming downloads whose connections have expired.

chrome/browser/download/download_file_manager.h

 // Copyright (c) 2010 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.
 //
 // The DownloadFileManager owns a set of DownloadFile objects, each of which
 // represent one in progress download and performs the disk IO for that
 // download. The DownloadFileManager itself is a singleton object owned by the
 // ResourceDispatcherHost.
 //
 // The DownloadFileManager uses the file_thread for performing file write
@@ skipping 56 matching lines @@
 
  public:
   explicit DownloadFileManager(ResourceDispatcherHost* rdh);
 
   // Called on shutdown on the UI thread.
   void Shutdown();
 
   // Called on the IO thread
   int GetNextId();
 
+  // Return the ID that matches |url| and |path|, or -1 if not found.
+  int GetDownloadId(const GURL& url, const FilePath& path) const;
+
   // Called on UI thread to make DownloadFileManager start the download.
   void StartDownload(DownloadCreateInfo* info);
 
   // Handlers for notifications sent from the IO thread and run on the
   // download thread.
   void UpdateDownload(int id, DownloadBuffer* buffer);
   void CancelDownload(int id);
-  void OnResponseCompleted(int id, DownloadBuffer* buffer);
+  void OnResponseCompleted(int id,
+                           DownloadBuffer* buffer,
+                           int os_error,
+                           const std::string& security_info);
 
   // Called on FILE thread by DownloadManager at the beginning of its shutdown.
   void OnDownloadManagerShutdown(DownloadManager* manager);
 
   // The DownloadManager in the UI thread has provided an intermediate
   // .crdownload name for the download specified by 'id'.
   void OnIntermediateDownloadName(int id, const FilePath& full_path,
                                   DownloadManager* download_manager);
 
   // The download manager has provided a final name for a download. Sent from
@@ skipping 43 matching lines @@
   // Schedule periodic updates of the download progress. This timer
   // is controlled from the FILE thread, and posts updates to the UI thread.
   base::RepeatingTimer<DownloadFileManager> update_timer_;
 
   ResourceDispatcherHost* resource_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_MANAGER_H_