Implement suspend/resume for IntersectionObserver notifications.

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 669 matching lines @@
 
     bool hasMutationObserversOfType(MutationObserver::MutationType type) const
     {
         return m_mutationObserverTypes & type;
     }
     bool hasMutationObservers() const { return m_mutationObserverTypes; }
     void addMutationObserverTypes(MutationObserverOptions types) { m_mutationObserverTypes |= types; }
 
     WeakPtrWillBeRawPtr<Document> createWeakPtr();
 
+    IntersectionObserverController* intersectionObserverController();
     IntersectionObserverController& ensureIntersectionObserverController();
 
     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
@@ skipping 748 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