[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 f2d1ad77a72c5a5de7b5afb0b0e1a7b6dee7e7e8..ebc5be1e6f2877a6c897e0bf3328d624a40e0f7e 100644
--- a/extensions/renderer/event_bindings.h
+++ b/extensions/renderer/event_bindings.h
@@ -26,6 +26,11 @@ 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|.
@@ -70,6 +75,9 @@ 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);