Revert of Use Document, rather than document element, for implicit root.

third_party/WebKit/Source/core/dom/NodeIntersectionObserverData.cpp

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "core/dom/NodeIntersectionObserverData.h"
-
-#include "core/dom/Document.h"
-#include "core/dom/IntersectionObservation.h"
-#include "core/dom/IntersectionObserver.h"
-#include "core/dom/IntersectionObserverController.h"
-
-namespace blink {
-
-NodeIntersectionObserverData::NodeIntersectionObserverData() { }
-
-NodeIntersectionObserverData::~NodeIntersectionObserverData() { }
-
-bool NodeIntersectionObserverData::hasIntersectionObserver() const
-{
-    return !m_intersectionObservers.isEmpty();
-}
-
-bool NodeIntersectionObserverData::hasIntersectionObservation() const
-{
-    return !m_intersectionObservations.isEmpty();
-}
-
-IntersectionObservation* NodeIntersectionObserverData::getObservationFor(IntersectionObserver& observer)
-{
-    auto i = m_intersectionObservations.find(&observer);
-    if (i == m_intersectionObservations.end())
-        return nullptr;
-    return i->value;
-}
-
-void NodeIntersectionObserverData::addObservation(IntersectionObservation& observation)
-{
-    m_intersectionObservations.add(&observation.observer(), &observation);
-}
-
-void NodeIntersectionObserverData::removeObservation(IntersectionObserver& observer)
-{
-    m_intersectionObservations.remove(&observer);
-}
-
-void NodeIntersectionObserverData::activateValidIntersectionObservers(Node& node)
-{
-    IntersectionObserverController& controller = node.document().ensureIntersectionObserverController();
-    // Activate observers for which node is root.
-    for (auto& observer : m_intersectionObservers) {
-        controller.addTrackedObserver(*observer);
-        observer->setActive(true);
-    }
-    // A document can be root, but not target.
-    if (node.isDocumentNode())
-        return;
-    // Active observers for which node is target.
-    for (auto& observation : m_intersectionObservations)
-        observation.value->setActive(observation.key->isDescendantOfRoot(&toElement(node)));
-}
-
-void NodeIntersectionObserverData::deactivateAllIntersectionObservers(Node& node)
-{
-    node.document().ensureIntersectionObserverController().removeTrackedObserversForRoot(node);
-    for (auto& observer : m_intersectionObservers)
-        observer->setActive(false);
-    for (auto& observation : m_intersectionObservations)
-        observation.value->setActive(false);
-}
-
-#if !ENABLE(OILPAN)
-void NodeIntersectionObserverData::dispose()
-{
-    HeapVector<Member<IntersectionObserver>> observersToDisconnect;
-    copyToVector(m_intersectionObservers, observersToDisconnect);
-    for (auto& observer : observersToDisconnect)
-        observer->disconnect();
-    ASSERT(m_intersectionObservers.isEmpty());
-}
-#endif
-
-WeakPtrWillBeRawPtr<Node> NodeIntersectionObserverData::createWeakPtr(Node* node)
-{
-#if ENABLE(OILPAN)
-    return node;
-#else
-    if (!m_weakPointerFactory)
-        m_weakPointerFactory = adoptPtrWillBeNoop(new WeakPtrFactory<Node>(node));
-    WeakPtr<Node> result = m_weakPointerFactory->createWeakPtr();
-    ASSERT(result.get() == node);
-    return result;
-#endif
-}
-
-DEFINE_TRACE(NodeIntersectionObserverData)
-{
-    visitor->trace(m_intersectionObservers);
-    visitor->trace(m_intersectionObservations);
-}
-
-} // namespace blink