IntersectionObserver: second cut.

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

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index b4b5cbbf086bb47984c4ae36cce8ae609a699e61..002973d2ee2fb2931e4aeff864503e13c0170f16 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -56,6 +56,8 @@ class ElementRareData;
 class ElementShadow;
 class ExceptionState;
 class Image;
+class IntersectionObservation;
+class IntersectionObserver;
 class IntSize;
 class Locale;
 class MutableStylePropertySet;
@@ -538,6 +540,13 @@ public:
 
     SpellcheckAttributeState spellcheckAttributeState() const;
 
+    WeakPtr<Element> createWeakPtr();
+
+    void addIntersectionObservation(IntersectionObservation&);
+    void removeIntersectionObservation(IntersectionObservation&);
+
+    bool computeIntersection(Element*, LayoutRect&, LayoutRect&, LayoutRect&);
+
 protected:
     Element(const QualifiedName& tagName, Document*, ConstructionType);
 
@@ -681,6 +690,8 @@ private:
     void detachAttrNodeFromElementWithValue(Attr*, const AtomicString& value);
     void detachAttrNodeAtIndex(Attr*, size_t index);
 
+    void disconnectIntersectionObservations();
+
     v8::Local<v8::Object> wrapCustomElement(v8::Isolate*, v8::Local<v8::Object> creationContext);
 
     RefPtrWillBeMember<ElementData> m_elementData;