Start sending auxclick instead of click for non-primary buttons

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 277 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 (eventType == EventTypeNames::auxclick) {
+        if (LocalDOMWindow* executingWindow = this->executingWindow()) {
+            UseCounter::count(executingWindow->document(), UseCounter::AuxclickAddListenerCount);
+        }
+    } else if (EventUtil::isPointerEventType(eventType)) {
         if (LocalDOMWindow* executingWindow = this->executingWindow()) {
             UseCounter::count(executingWindow->document(), UseCounter::PointerEventAddListenerCount);
         }
     } else if (eventType == EventTypeNames::slotchange) {
         if (LocalDOMWindow* executingWindow = this->executingWindow()) {
             UseCounter::count(executingWindow->document(), UseCounter::SlotChangeEventAddListener);
         }
     }
 }
 
@@ skipping 385 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