IntersectionObserver: second cut.

third_party/WebKit/Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 108 matching lines @@
 class HTMLFrameOwnerElement;
 class HTMLHeadElement;
 class HTMLImportLoader;
 class HTMLImportsController;
 class HTMLLinkElement;
 class HTMLScriptElement;
 class HitTestRequest;
 class IdleRequestCallback;
 class IdleRequestOptions;
 class InputDeviceCapabilities;
+class IntersectionObservationRegistry;
 class LayoutPoint;
 class LiveNodeListBase;
 class Locale;
 class LocalFrame;
 class Location;
 class MainThreadTaskRunner;
 class MediaQueryListListener;
 class MediaQueryMatcher;
 class NodeFilter;
 class NodeIterator;
@@ skipping 529 matching lines @@
     bool hasListenerType(ListenerType listenerType) const { return (m_listenerTypes & listenerType); }
     void addListenerTypeIfNeeded(const AtomicString& eventType);
 
     bool hasMutationObserversOfType(MutationObserver::MutationType type) const
     {
         return m_mutationObserverTypes & type;
     }
     bool hasMutationObservers() const { return m_mutationObserverTypes; }
     void addMutationObserverTypes(MutationObserverOptions types) { m_mutationObserverTypes |= types; }
 
+    WeakPtr<Document> createWeakPtr();
+
+    IntersectionObservationRegistry* intersectionObservationRegistry();
+    void deliverIntersectionObservationsTimerFired(Timer<Document>*);
+
     void updateViewportDescription();
     void processReferrerPolicy(const String& policy);
 
     // Returns the owning element in the parent document.
     // Returns nullptr if this is the top level document.
     HTMLFrameOwnerElement* ownerElement() const;
 
     // Returns true if this document belongs to a frame that the parent document
     // made invisible (for instance by setting as style display:none).
     bool isInInvisibleSubframe() const;
@@ skipping 635 matching lines @@
 #endif
     WeakPtrWillBeWeakMember<Document> m_contextDocument;
 
     bool m_hasFullscreenSupplement; // For early return in Fullscreen::fromIfExists()
 
     WillBeHeapVector<RefPtrWillBeMember<Element>> m_topLayerElements;
 
     int m_loadEventDelayCount;
     Timer<Document> m_loadEventDelayTimer;
     Timer<Document> m_pluginLoadingTimer;
+    Timer<Document> m_deliverIntersectionObservationsTimer;
 
     ViewportDescription m_viewportDescription;
     ViewportDescription m_legacyViewportDescription;
     Length m_viewportDefaultMinWidth;
 
     ReferrerPolicy m_referrerPolicy;
 
     DocumentTiming m_documentTiming;
     RefPtrWillBeMember<MediaQueryMatcher> m_mediaQueryMatcher;
     bool m_writeRecursionIsTooDeep;
@@ skipping 40 matching lines @@
     int m_styleRecalcElementCounter;
 
     ParserSynchronizationPolicy m_parserSyncPolicy;
 
     OriginsUsingFeatures::Value m_originsUsingFeaturesValue;
 
     ClientHintsPreferences m_clientHintsPreferences;
 
     PersistentWillBeMember<CanvasFontCache> m_canvasFontCache;
 
+    PersistentWillBeMember<IntersectionObservationRegistry> m_intersectionObservationRegistry;
+    OwnPtrWillBeMember<WeakPtrFactory<Document>> m_weakPointerFactory;

[dcheng, 2015/11/20 20:35:07]

WeakPtrFactory is not a garbage collected object, so this should just be an
OwnPtr. Oilpan's WeakMembers, etc. are completely different from WeakPtr (which
is really basically the same thing as base::WeakPtrFactoryin Chrome).

[szager1, 2015/11/20 22:02:23]

I just noticed that Document already has an m_weakFactory member; I'm going to
use that instead, and #if ENABLE(OILPAN) appropriately.

+
     int m_nodeCount;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT WillBeHeapSupplement<Document>;
 
 inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin)
 {
     // The different (legacy) meta tags have different priorities based on the type
     // regardless of which order they appear in the DOM. The priority is given by the
     // ViewportDescription::Type enum.
@@ skipping 30 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h