IntersectionObserver: second cut.

third_party/WebKit/Source/core/frame/FrameView.h

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index adcc338895dd9fc8dce6559a34760cc37c58926f..efe07dab9451f92564b7db03266e814d60cc8cd0 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -745,9 +745,9 @@ private:
     template <typename Function> void forAllNonThrottledFrameViews(Function);
 
     void setNeedsUpdateViewportIntersection();
-    void updateViewportIntersectionsForSubtree();
+    void updateViewportIntersectionsForSubtree(LifeCycleUpdateOption);
     void updateViewportIntersectionIfNeeded();
-    void notifyIntersectionObservers();
+    void notifyRenderThrottlingObservers();
 
     // PaintInvalidationCapableScrollableArea
     LayoutBox& boxForScrollControlPaintInvalidation() const override;
@@ -786,7 +786,7 @@ private:
     unsigned m_nestedLayoutCount;
     Timer<FrameView> m_postLayoutTasksTimer;
     Timer<FrameView> m_updateWidgetsTimer;
-    OwnPtr<CancellableTaskFactory> m_intersectionObserverNotificationFactory;
+    OwnPtr<CancellableTaskFactory> m_renderThrottlingObserverNotificationFactory;
 
     bool m_firstLayout;
     bool m_isTransparent;