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

chrome/renderer/extensions/extension_helper.cc

 // 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.
 
 #include "chrome/renderer/extensions/extension_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_string_value_serializer.h"
@@ skipping 235 matching lines @@
   // gets called for navigations within the document.
   if (g_schedulers.Get().count(frame))
     return;
 
   g_schedulers.Get()[frame] = new UserScriptScheduler(frame, dispatcher_);
 }
 
 void ExtensionHelper::OnExtensionResponse(int request_id,
                                           bool success,
                                           const base::ListValue& response,
-                                          const std::string& error) {
+                                          const std::string& error,
+                                          const bool response_user_gesture) {
+  scoped_ptr<WebScopedUserGesture> user_gesture;
+  if (response_user_gesture)
+    user_gesture.reset(new WebScopedUserGesture);
+
   dispatcher_->OnExtensionResponse(request_id,
                                    success,
                                    response,
                                    error);
 }
 
 void ExtensionHelper::OnExtensionMessageInvoke(const std::string& extension_id,
                                                const std::string& module_name,
                                                const std::string& function_name,
                                                const base::ListValue& args,
@@ skipping 103 matching lines @@
       render_view()->GetWebView()->mainFrame()->mainWorldScriptContext();
   ChromeV8Context* chrome_v8_context =
       dispatcher_->v8_context_set().GetByV8Context(script_context);
   if (!chrome_v8_context)
     return;
   chrome_v8_context->module_system()->CallModuleMethod(
       "app.window", "onAppWindowClosed");
 }
 
 }  // namespace extensions