Generate scroll/clip display item hierarchy for SPv2

Source/core/paint/LayerFixedPositionRecorder.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LayerFixedPositionRecorder_h
 #define LayerFixedPositionRecorder_h
 
 #include "wtf/FastAllocBase.h"
 
 namespace blink {
 
 class GraphicsContext;
 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
 
 #endif // LayerFixedPositionRecorder_h