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

extensions/browser/extension_function.h

Index: extensions/browser/extension_function.h
===================================================================
--- extensions/browser/extension_function.h	(revision 262146)
+++ extensions/browser/extension_function.h	(working copy)
@@ -95,7 +95,9 @@
 
   typedef base::Callback<void(ResponseType type,
                               const base::ListValue& results,
-                              const std::string& error)> ResponseCallback;
+                              const std::string& error,
+                              const bool response_user_gesture)>
+                                  ResponseCallback;
 
   ExtensionFunction();
 
@@ -182,6 +184,11 @@
   void set_user_gesture(bool user_gesture) { user_gesture_ = user_gesture; }
   bool user_gesture() const { return user_gesture_; }
 
+  void set_response_user_gesture(bool response_user_gesture) {
+    response_user_gesture_ = response_user_gesture;
+  }
+  bool response_user_gesture() const { return response_user_gesture_; }
+
   void set_histogram_value(
       extensions::functions::HistogramValue histogram_value) {
     histogram_value_ = histogram_value; }
@@ -245,6 +252,9 @@
   // True if the call was made in response of user gesture.
   bool user_gesture_;
 
+  // True if the response callback should include a user gesture.
+  bool response_user_gesture_;
+
   // The arguments to the API. Only non-null if argument were specified.
   scoped_ptr<base::ListValue> args_;