[DevTools] added creation stack for event listeners without scheduled stack

third_party/WebKit/Source/core/events/EventTarget.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 272 matching lines @@
   return AddEventListenerInternal(event_type, listener, options);
 }
 
 bool EventTarget::AddEventListenerInternal(
     const AtomicString& event_type,
     EventListener* listener,
     const AddEventListenerOptionsResolved& options) {
   if (!listener)
     return false;
 
+  probe::AsyncTaskScheduled(GetExecutionContext(), event_type, listener);
+
   V8DOMActivityLogger* activity_logger =
       V8DOMActivityLogger::CurrentActivityLoggerIfIsolatedWorld();
   if (activity_logger) {
     Vector<String> argv;
     argv.push_back(ToNode() ? ToNode()->nodeName() : InterfaceName());
     argv.push_back(event_type);
     activity_logger->LogEvent("blinkAddEventListener", argv.size(),
                               argv.data());
   }
 
@@ skipping 399 matching lines @@
 
     // If stopImmediatePropagation has been called, we just break out
     // immediately, without handling any more events on this target.
     if (event->ImmediatePropagationStopped())
       break;
 
     event->SetHandlingPassive(EventPassiveMode(registered_listener));
     bool passive_forced = registered_listener.PassiveForcedForDocumentTarget();
 
     probe::UserCallback probe(context, nullptr, event->type(), false, this);
+    probe::AsyncTask async_task(context, listener, "Event Listener called");
 
     // To match Mozilla, the AT_TARGET phase fires both capturing and bubbling
     // event listeners, even though that violates some versions of the DOM spec.
     listener->handleEvent(context, event);
     fired_listener = true;
 
     // If we're about to report this event listener as blocking, make sure it
     // wasn't removed while handling the event.
     if (should_report_blocked_event && i > 0 &&
         entry[i - 1].Listener() == listener && !entry[i - 1].Passive() &&
@@ skipping 53 matching lines @@
   // they have one less listener to invoke.
   if (d->firing_event_iterators) {
     for (const auto& iterator : *d->firing_event_iterators) {
       iterator.iterator = 0;
       iterator.end = 0;
     }
   }
 }
 
 }  // namespace blink