Add the feature to retain the user gesture in the extension callback

chrome/renderer/extensions/request_sender.h

 // Copyright (c) 2012 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 CHROME_RENDERER_EXTENSIONS_REQUEST_SENDER_H_
 #define CHROME_RENDERER_EXTENSIONS_REQUEST_SENDER_H_
 
 #include <string>
 #include <map>
 
@@ skipping 62 matching lines @@
                     const std::string& name,
                     int request_id,
                     bool has_callback,
                     bool for_io_thread,
                     base::ListValue* value_args);
 
   // Handles responses from the extension host to calls made by StartRequest().
   void HandleResponse(int request_id,
                       bool success,
                       const base::ListValue& response,
-                      const std::string& error);
+                      const std::string& error,
+                      bool user_gesture);
 
   // Notifies this that a request source is no longer valid.
   // TODO(kalman): Do this in a generic/safe way.
   void InvalidateSource(Source* source);
 
  private:
   friend class ScopedTabID;
   typedef std::map<int, linked_ptr<PendingRequest> > PendingRequestMap;
 
   void InsertRequest(int request_id, PendingRequest* pending_request);
   linked_ptr<PendingRequest> RemoveRequest(int request_id);
 
   Dispatcher* dispatcher_;
   PendingRequestMap pending_requests_;
 
   int source_tab_id_;  // Id of the tab sending the request, or -1 if no tab.
 
   DISALLOW_COPY_AND_ASSIGN(RequestSender);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_REQUEST_SENDER_H_