Generate a file name when dragging an image to the desktop

webkit/glue/webdropdata.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 struct for managing data being dropped on a webview.  This represents a
 // union of all the types of data that can be dropped in a platform neutral
 // way.
 
 #ifndef WEBKIT_GLUE_WEBDROPDATA_H_
 #define WEBKIT_GLUE_WEBDROPDATA_H_
 
 #include <string>
 #include <vector>
 #include "googleurl/src/gurl.h"
 
 struct IDataObject;
 
 struct WebDropData {
   // User is dropping a link on the webview.
   GURL url;
   std::wstring url_title;  // The title associated with |url|.
 
+  // File extension for dragging images from a webview to the desktop.
+  std::wstring file_extension;
+
   // User is dropping one or more files on the webview.
   std::vector<std::wstring> filenames;
 
   // User is dragging plain text into the webview.
   std::wstring plain_text;
 
   // User is dragging text/html into the webview (e.g., out of Firefox). 
   // |html_base_url| is the URL that the html fragment is taken from (used to
   // resolve relative links).  It's ok for |html_base_url| to be empty.
   std::wstring text_html;
   GURL html_base_url;
 
   // User is dragging data from the webview (e.g., an image).
   std::wstring file_description_filename;
   std::string file_contents;
 
   // Helper method for converting Window's specific IDataObject to a WebDropData
   // object.  TODO(tc): Move this to the browser side since it's Windows
   // specific and no longer used in webkit.
   static void PopulateWebDropData(IDataObject* data_object,
                                   WebDropData* drop_data);
 };
 
 #endif  // WEBKIT_GLUE_WEBDROPDATA_H_