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 ebfc224ae38a9c19793658a19a97a4c50725b3b3..bef14cc1a4ee5a6debddd9977ee0bc2f54ddc8e3 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -741,7 +741,7 @@ private:
     void setNeedsUpdateViewportIntersection();
     void updateViewportIntersectionsForSubtree();
     void updateViewportIntersectionIfNeeded();
-    void notifyIntersectionObservers();
+    void notifyRenderThrottlingObservers();
 
     // PaintInvalidationCapableScrollableArea
     LayoutBox& boxForScrollControlPaintInvalidation() const override;
@@ -780,7 +780,7 @@ 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;
@@ -884,6 +884,7 @@ private:
     //     +---[ scrollTranslation ]    Frame scrolling. This is going away in favor of Settings::rootLayerScrolls.
     RefPtr<TransformPaintPropertyNode> m_preTranslation;
     RefPtr<TransformPaintPropertyNode> m_scrollTranslation;
+
 };
 
 inline void FrameView::incrementVisuallyNonEmptyCharacterCount(unsigned count)