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

chrome/renderer/extensions/extension_helper.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_EXTENSION_HELPER_H_
 #define CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 57 matching lines @@
       blink::WebFrame* frame,
       const blink::WebVector<blink::WebString>& newly_matching_selectors,
       const blink::WebVector<blink::WebString>& stopped_matching_selectors)
       OVERRIDE;
   virtual void DidCreateDataSource(blink::WebFrame* frame,
                                    blink::WebDataSource* ds) OVERRIDE;
   virtual void DraggableRegionsChanged(blink::WebFrame* frame) OVERRIDE;
 
   void OnExtensionResponse(int request_id, bool success,
                            const base::ListValue& response,
-                           const std::string& error);
+                           const std::string& error,
+                           const bool user_gesture);
   void OnExtensionMessageInvoke(const std::string& extension_id,
                                 const std::string& module_name,
                                 const std::string& function_name,
                                 const base::ListValue& args,
                                 bool user_gesture);
   void OnExtensionDispatchOnConnect(
       int target_port_id,
       const std::string& channel_name,
       const base::DictionaryValue& source_tab,
       const ExtensionMsg_ExternalConnectionInfo& info,
@@ skipping 30 matching lines @@
 
   // Id number of browser window which RenderView is attached to.
   int browser_window_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_