Support dragging a virtual file out of the browser.

chrome/browser/views/download_item_view.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.
 //
 // A ChromeView that implements one download on the Download shelf.
 // Each DownloadItemView contains an application icon, a text label
 // indicating the download's file name, a text label indicating the
 // download's status (such as the number of bytes downloaded so far)
 // and a button for canceling an in progress download, or opening
 // the completed download.
@@ skipping 34 matching lines @@
                          public DownloadItem::Observer,
                          public AnimationDelegate {
  public:
   DownloadItemView(DownloadItem* download,
                    DownloadShelfView* parent,
                    BaseDownloadItemModel* model);
   virtual ~DownloadItemView();
 
   // DownloadObserver method
   virtual void OnDownloadUpdated(DownloadItem* download);
+  virtual void OnDownloadFileCompleted(DownloadItem* download) { }
   virtual void OnDownloadOpened(DownloadItem* download);
 
   // View overrides
   virtual void Layout();
   virtual void Paint(gfx::Canvas* canvas);
   virtual gfx::Size GetPreferredSize();
   virtual void OnMouseExited(const views::MouseEvent& event);
   virtual void OnMouseMoved(const views::MouseEvent& event);
   virtual bool OnMousePressed(const views::MouseEvent& event);
   virtual void OnMouseReleased(const views::MouseEvent& event, bool canceled);
@@ skipping 180 matching lines @@
   // downloaded file.
   ScopedRunnableMethodFactory<DownloadItemView> reenable_method_factory_;
 
   // The currently running download context menu.
   DownloadShelfContextMenuWin* active_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemView);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_DOWNLOAD_ITEM_VIEW_H__