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 93a27d039e0a717a13877f67d8eda1cceddd8b5f..e80b9c536efe34fa4959f3aae2b9699f0a16e28b 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;
@@ -551,6 +553,11 @@ public:
 
     SpellcheckAttributeState spellcheckAttributeState() const;
 
+    WeakPtrWillBeRawPtr<Element> createWeakPtr();
+
+    void addIntersectionObservation(IntersectionObservation&);
+    void removeIntersectionObservation(IntersectionObservation&);
+
 protected:
     Element(const QualifiedName& tagName, Document*, ConstructionType);