Add runtime setting to force 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 36 matching lines @@
 #include "platform/EventDispatchForbiddenScope.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 
 using namespace WTF;
 
 namespace blink {
 namespace {
 
-void setDefaultEventListenerOptionsLegacy(EventListenerOptions& options, bool useCapture)
+Settings* windowSettings(LocalDOMWindow* executingWindow)
 {
-    options.setCapture(useCapture);
-}
-
-void setDefaultAddEventListenerOptionsLegacy(AddEventListenerOptions& options, bool useCapture)
-{
-    setDefaultEventListenerOptionsLegacy(options, useCapture);
-    options.setPassive(false);
-}
-
-void setDefaultAddEventListenerOptions(AddEventListenerOptions& options)
-{
-    if (!options.hasPassive())
-        options.setPassive(false);
+    if (executingWindow) {
+        if (LocalFrame* frame = executingWindow->frame()) {
+            return frame->settings();
+        }
+    }
+    return nullptr;
 }
 
 double blockedEventsWarningThreshold(const ExecutionContext* context, const Event* event)
 {
     if (!event->cancelable())
         return 0.0;
     const AtomicString& eventType = event->type();
     if (eventType != EventTypeNames::touchstart
         && eventType != EventTypeNames::touchmove
         && eventType != EventTypeNames::touchend
@@ skipping 100 matching lines @@
     return nullptr;
 }
 
 inline LocalDOMWindow* EventTarget::executingWindow()
 {
     if (ExecutionContext* context = getExecutionContext())
         return context->executingWindow();
     return nullptr;
 }
 
+void EventTarget::setDefaultAddEventListenerOptions(AddEventListenerOptions& options)
+{
+    if (Settings* settings = windowSettings(executingWindow())) {
+        switch (settings->passiveListenerDefault()) {
+        case PassiveListenerDefault::False:
+            if (!options.hasPassive())
+                options.setPassive(false);
+            break;
+        case PassiveListenerDefault::True:
+            if (!options.hasPassive())
+                options.setPassive(true);
+            break;
+        case PassiveListenerDefault::ForceAllTrue:
+            options.setPassive(true);
+            break;
+        case PassiveListenerDefault::DocumentTrue:
+            if (!options.hasPassive()) {
+                if (Node* node = toNode()) {
+                    if (node->isDocumentNode() || node->document().documentElement() == node || node->document().body() == node) {
+                        options.setPassive(true);
+                    }
+                } else if (toLocalDOMWindow()) {
+                    options.setPassive(true);
+                }
+            }
+            break;
+        }
+    } else {
+        if (!options.hasPassive())
+            options.setPassive(false);
+    }
+}
+
 bool EventTarget::addEventListener(const AtomicString& eventType, EventListener* listener, bool useCapture)
 {
     AddEventListenerOptions options;
-    setDefaultAddEventListenerOptionsLegacy(options, useCapture);
+    options.setCapture(useCapture);
+    setDefaultAddEventListenerOptions(options);
     return addEventListenerInternal(eventType, listener, options);
 }
 
 bool EventTarget::addEventListener(const AtomicString& eventType, EventListener* listener, const AddEventListenerOptionsOrBoolean& optionsUnion)
 {
     if (optionsUnion.isBoolean())
         return addEventListener(eventType, listener, optionsUnion.getAsBoolean());
     if (optionsUnion.isAddEventListenerOptions()) {
         AddEventListenerOptions options = optionsUnion.getAsAddEventListenerOptions();
         return addEventListener(eventType, listener, options);
@@ skipping 32 matching lines @@
     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);
+    options.setCapture(useCapture);
     return removeEventListenerInternal(eventType, listener, options);
 }
 
 bool EventTarget::removeEventListener(const AtomicString& eventType, const EventListener* listener, const EventListenerOptionsOrBoolean& optionsUnion)
 {
     if (optionsUnion.isBoolean())
         return removeEventListener(eventType, listener, optionsUnion.getAsBoolean());
     if (optionsUnion.isEventListenerOptions()) {
         EventListenerOptions options = optionsUnion.getAsEventListenerOptions();
         return removeEventListener(eventType, listener, options);
@@ skipping 328 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