[Extensions Bindings] Return result from event dispatch

extensions/renderer/api_event_handler.h

Index: extensions/renderer/api_event_handler.h
diff --git a/extensions/renderer/api_event_handler.h b/extensions/renderer/api_event_handler.h
index 35278bba8a2f2fce6487eb733ae8d5d2ab448c70..e7b4cc99cef7fe6cde9e4e086622b0fe93b58f75 100644
--- a/extensions/renderer/api_event_handler.h
+++ b/extensions/renderer/api_event_handler.h
@@ -39,6 +39,7 @@ class APIEventHandler {
                           v8::Local<v8::Context>)>;
 
   APIEventHandler(const binding::RunJSFunction& call_js,
+                  const binding::RunJSFunctionSync& call_js_sync,
                   const EventListenersChangedMethod& listeners_changed);
   ~APIEventHandler();
 
@@ -90,6 +91,7 @@ class APIEventHandler {
  private:
   // Method to run a given v8::Function. Curried in for testing.
   binding::RunJSFunction call_js_;
+  binding::RunJSFunctionSync call_js_sync_;
 
   EventListenersChangedMethod listeners_changed_;