IntersectionObserver: second cut.

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

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 91b3c4ee763bb9b41ea15a19dbd6daba7d11c192..7e996cd4f93353633b8ac9b10711d049a50255ba 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -126,6 +126,7 @@ class HitTestRequest;
 class IdleRequestCallback;
 class IdleRequestOptions;
 class InputDeviceCapabilities;
+class IntersectionObserverController;
 class LayoutPoint;
 class LiveNodeListBase;
 class Locale;
@@ -684,6 +685,10 @@ public:
     bool hasMutationObservers() const { return m_mutationObserverTypes; }
     void addMutationObserverTypes(MutationObserverOptions types) { m_mutationObserverTypes |= types; }
 
+    WeakPtrWillBeRawPtr<Document> createWeakPtr();
+
+    IntersectionObserverController& ensureIntersectionObserverController();
+
     void updateViewportDescription();
     void processReferrerPolicy(const String& policy);
 
@@ -1398,6 +1403,8 @@ private:
 
     PersistentWillBeMember<CanvasFontCache> m_canvasFontCache;
 
+    PersistentWillBeMember<IntersectionObserverController> m_intersectionObserverController;
+
     int m_nodeCount;
 };