[Extensions Bindings] Request JS execution from messaging bindings

extensions/renderer/event_bindings.h

Index: extensions/renderer/event_bindings.h
diff --git a/extensions/renderer/event_bindings.h b/extensions/renderer/event_bindings.h
index 72bb7f6d6674468ad0131414a37faed8f6817810..02f0bbdb435144c9e438f115009440c489748e76 100644
--- a/extensions/renderer/event_bindings.h
+++ b/extensions/renderer/event_bindings.h
@@ -30,6 +30,11 @@ class EventBindings : public ObjectBackedNativeHandler {
   explicit EventBindings(ScriptContext* context);
   ~EventBindings() override;
 
+  // Returns true if there is a listener for the given |event| in the given
+  // |context|.
+  static bool HasListener(ScriptContext* context,
+                          const std::string& event_name);
+
  private:
   // JavaScript handler which forwards to AttachEvent().
   // args[0] forwards to |event_name|.
@@ -74,6 +79,9 @@ class EventBindings : public ObjectBackedNativeHandler {
 
   void MatchAgainstEventFilter(const v8::FunctionCallbackInfo<v8::Value>& args);
 
+  void AttachUnmanagedEvent(const v8::FunctionCallbackInfo<v8::Value>& args);
+  void DetachUnmanagedEvent(const v8::FunctionCallbackInfo<v8::Value>& args);
+
   std::unique_ptr<EventMatcher> ParseEventMatcher(
       std::unique_ptr<base::DictionaryValue> filter);