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 19 matching lines @@
  */
 
 #include "core/events/EventTarget.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8AbstractEventListener.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 127 matching lines @@
 
     RegisteredEventListener registeredListener;
     bool added = ensureEventTargetData().eventListenerMap.add(eventType, listener, options, &registeredListener);
     if (added)
         addedEventListener(eventType, registeredListener);
     return added;
 }
 
 void EventTarget::addedEventListener(const AtomicString& eventType, RegisteredEventListener& registeredListener)
 {
+    if (EventUtil::isPointerEventType(eventType)) {
+        if (LocalDOMWindow* executingWindow = this->executingWindow()) {
+            UseCounter::count(executingWindow->document(), UseCounter::PointerEventAddListenerCount);
+        }
+    }
 }
 
 bool EventTarget::removeEventListener(const AtomicString& eventType, const EventListener* listener, bool useCapture)
 {
     EventListenerOptions options;
     setDefaultEventListenerOptionsLegacy(options, useCapture);
     return removeEventListenerInternal(eventType, listener, options);
 }
 
 bool EventTarget::removeEventListener(const AtomicString& eventType, const EventListener* listener, const EventListenerOptionsOrBoolean& optionsUnion)
@@ skipping 321 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