Usecounter added for counting usage of addEventListener for PointerEvents.

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 18 matching lines @@
  *
  */
 
 #include "core/events/EventTarget.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8DOMActivityLogger.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/editing/Editor.h"
 #include "core/events/Event.h"
+#include "core/events/EventUtil.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/UseCounter.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 
 using namespace WTF;
 
@@ skipping 96 matching lines @@
 {
     setDefaultEventListenerOptions(options);
     return addEventListenerInternal(eventType, listener, options);
 }
 
 bool EventTarget::addEventListenerInternal(const AtomicString& eventType, EventListener* listener, const EventListenerOptions& options)
 {
     if (!listener)
         return false;
 
+    if (EventUtil::isPointerEventType(eventType)) {

[bokan, 2016/05/10 22:52:01]

Put this in the addedEventListener method below.

[sahel, 2016/05/11 21:15:02]

Done.

+        if (LocalDOMWindow* executingWindow = this->executingWindow()) {
+            UseCounter::count(executingWindow->document(), UseCounter::PointerEventAddListenerCount);
+        }
+    }
     V8DOMActivityLogger* activityLogger = V8DOMActivityLogger::currentActivityLoggerIfIsolatedWorld();
     if (activityLogger) {
         Vector<String> argv;
         argv.append(toNode() ? toNode()->nodeName() : interfaceName());
         argv.append(eventType);
         activityLogger->logEvent("blinkAddEventListener", argv.size(), argv.data());
     }
 
     RegisteredEventListener registeredListener;
     bool added = ensureEventTargetData().eventListenerMap.add(eventType, listener, options, &registeredListener);
@@ skipping 339 matching lines @@
     // they have one less listener to invoke.
     if (d->firingEventIterators) {
         for (size_t i = 0; i < d->firingEventIterators->size(); ++i) {
             d->firingEventIterators->at(i).iterator = 0;
             d->firingEventIterators->at(i).end = 0;
         }
     }
 }
 
 } // namespace blink