[Extensions Bindings] Request JS execution from messaging bindings

extensions/renderer/extension_bindings_system.h

Index: extensions/renderer/extension_bindings_system.h
diff --git a/extensions/renderer/extension_bindings_system.h b/extensions/renderer/extension_bindings_system.h
index e40858e0751d80eaf4a7a106270f12901e0fa241..0f5991360b92ffcae770498f7fd2427247ef3d36 100644
--- a/extensions/renderer/extension_bindings_system.h
+++ b/extensions/renderer/extension_bindings_system.h
@@ -44,6 +44,11 @@ class ExtensionBindingsSystem {
       const base::DictionaryValue* filtering_info,
       ScriptContext* context) = 0;
 
+  // Returns true if there is a listener for the given |event_name| in the
+  // associated |context|.
+  virtual bool HasEventListenerInContext(const std::string& event_name,
+                                         ScriptContext* context) = 0;
+
   // Handles the response associated with the given |request_id|.
   virtual void HandleResponse(int request_id,
                               bool success,