Support dragging a virtual file out of the browser.

chrome/browser/download/download_file.h

 // Copyright (c) 2006-2008 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.
 //
 // Objects that handle file operations for downloads, on the download thread.
 //
 // 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.
@@ skipping 174 matching lines @@
   // Handlers for notifications sent from the download thread and run on
   // the UI thread.
   void OnStartDownload(DownloadCreateInfo* info);
   void OnDownloadFinished(int id, int64 bytes_so_far);
 
   // Download the URL. Called on the UI thread and forwarded to the
   // ResourceDispatcherHost on the IO thread.
   void DownloadUrl(const GURL& url,
                    const GURL& referrer,
                    const std::string& referrer_charset,
+                   const FilePath& save_file_path,
                    int render_process_host_id,
                    int render_view_id,
                    URLRequestContextGetter* request_context_getter);
 
   // Run on the IO thread to initiate the download of a URL.
   void OnDownloadUrl(const GURL& url,
                      const GURL& referrer,
                      const std::string& referrer_charset,
+                     const FilePath& save_file_path,
                      int render_process_host_id,
                      int render_view_id,
                      URLRequestContextGetter* request_context_getter);
 
   // Called on the UI thread to remove a download item or manager.
   void RemoveDownloadManager(DownloadManager* manager);
   void RemoveDownload(int id, DownloadManager* manager);
 
 #if !defined(OS_MACOSX)
   // The open and show methods run on the file thread, which does not work on
@@ skipping 68 matching lines @@
   // Used for progress updates on the UI thread, mapping download->id() to bytes
   // received so far. Written to by the file thread and read by the UI thread.
   typedef base::hash_map<int, int64> ProgressMap;
   ProgressMap ui_progress_;
   Lock progress_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_