Support registering and dispatching passive event listeners.

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 34 matching lines @@
 #include "wtf/Vector.h"
 
 using namespace WTF;
 
 namespace blink {
 namespace {
 
 void setDefaultEventListenerOptionsLegacy(EventListenerOptions& options, bool useCapture)
 {
     options.setCapture(useCapture);
+    options.setPassive(false);
 }
 
 void setDefaultEventListenerOptions(EventListenerOptions& options)
 {
     // The default for capture is based on whether the eventListenerOptions
     // runtime setting is enabled. That is
     // addEventListener('type', function(e) {}, {});
     // behaves differently under the setting. With the setting off
     // capture is true; with the setting on capture is false.
     if (!options.hasCapture())
         options.setCapture(!RuntimeEnabledFeatures::eventListenerOptionsEnabled());
+    if (!options.hasPassive())
+        options.setPassive(false);
 }
 
 } // namespace
 
 EventTargetData::EventTargetData()
 {
 }
 
 EventTargetData::~EventTargetData()
 {
@@ skipping 345 matching lines @@
 
         // If stopImmediatePropagation has been called, we just break out immediately, without
         // handling any more events on this target.
         if (event->immediatePropagationStopped())
             break;
 
         ExecutionContext* context = executionContext();
         if (!context)
             break;
 
+        event->setHandlingPassive(registeredListener.passive);
+
         InspectorInstrumentationCookie cookie = InspectorInstrumentation::willHandleEvent(this, event, registeredListener.listener.get(), registeredListener.useCapture);
 
         // To match Mozilla, the AT_TARGET phase fires both capturing and bubbling
         // event listeners, even though that violates some versions of the DOM spec.
         registeredListener.listener->handleEvent(context, event);
+        event->setHandlingPassive(false);
+
         RELEASE_ASSERT(i <= size);
 
         InspectorInstrumentation::didHandleEvent(cookie);
     }
     d->firingEventIterators->removeLast();
 }
 
 EventListenerVector* EventTarget::getEventListeners(const AtomicString& eventType)
 {
     EventTargetData* data = eventTargetData();
@@ skipping 19 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