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 e864d3f2279a5d6818698db822f95d7515453859..d3ef4af5fc7f964930f20a596019e9aa0d08daed 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 IntersectionObserverRegistry;
 class LayoutPoint;
 class LiveNodeListBase;
 class Locale;
@@ -675,6 +676,11 @@ public:
     bool hasMutationObservers() const { return m_mutationObserverTypes; }
     void addMutationObserverTypes(MutationObserverOptions types) { m_mutationObserverTypes |= types; }
 
+    WeakPtrWillBeRawPtr<Document> createWeakPtr();
+
+    IntersectionObserverRegistry* intersectionObserverRegistry();
+    void deliverIntersectionObservationsTimerFired(Timer<Document>*);
+
     void updateViewportDescription();
     void processReferrerPolicy(const String& policy);
 
@@ -1330,6 +1336,7 @@ private:
     int m_loadEventDelayCount;
     Timer<Document> m_loadEventDelayTimer;
     Timer<Document> m_pluginLoadingTimer;
+    Timer<Document> m_deliverIntersectionObservationsTimer;
 
     ViewportDescription m_viewportDescription;
     ViewportDescription m_legacyViewportDescription;
@@ -1390,6 +1397,8 @@ private:
 
     PersistentWillBeMember<CanvasFontCache> m_canvasFontCache;
 
+    PersistentWillBeMember<IntersectionObserverRegistry> m_intersectionObserverRegistry;
+
     int m_nodeCount;
 };