Generate scroll/clip display item hierarchy for SPv2

Source/core/paint/LayerFixedPositionRecorder.h

Index: Source/core/paint/LayerFixedPositionRecorder.h
diff --git a/Source/core/paint/LayerFixedPositionRecorder.h b/Source/core/paint/LayerFixedPositionRecorder.h
index 3037554556299e57fd4cf31682c3363ca44c63ea..ac9663c5bf7941d03411e4649f63babc9c39c196 100644
--- a/Source/core/paint/LayerFixedPositionRecorder.h
+++ b/Source/core/paint/LayerFixedPositionRecorder.h
@@ -15,14 +15,12 @@ class LayoutBoxModelObject;
 class LayerFixedPositionRecorder {
     WTF_MAKE_FAST_ALLOCATED(LayerFixedPositionRecorder);
 public:
-    explicit LayerFixedPositionRecorder(GraphicsContext&, const LayoutBoxModelObject&);
+    explicit LayerFixedPositionRecorder(GraphicsContext&, const LayoutBoxModelObject&, const LayoutBoxModelObject& anchor);
     ~LayerFixedPositionRecorder();
 
 private:
     GraphicsContext& m_graphicsContext;
     const LayoutBoxModelObject& m_layoutObject;
-    bool m_isFixedPosition;
-    bool m_isFixedPositionContainer;
 };
 
 } // namespace blink