[Reland] Correct fixed-position recording for Slimming Paint

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&);
+    ~LayerFixedPositionRecorder();
+
+private:
+    GraphicsContext& m_graphicsContext;
+    const LayoutBoxModelObject& m_layoutObject;
+    bool m_isFixedPosition;
+    bool m_isFixedPositionContainer;
+};
+
+} // namespace blink
+
+#endif // LayerFixedPositionRecorder_h