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 5a54f02f8c593c6a5ba010bac182c45e0f6444e6..3b9bd243213c0a471f5dad6fb323e632fcb7e0d9 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;
@@ -543,6 +545,13 @@ public:
 
     SpellcheckAttributeState spellcheckAttributeState() const;
 
+    WeakPtrWillBeRawPtr<Element> createWeakPtr();
+
+    void addIntersectionObservation(IntersectionObservation&);
+    void removeIntersectionObservation(IntersectionObservation&);
+
+    bool computeIntersection(Element*, LayoutRect&, LayoutRect&, LayoutRect&);
+
 protected:
     Element(const QualifiedName& tagName, Document*, ConstructionType);