Refactor ClipPathHelper in PaintLayerPainter.cpp for reuse

third_party/WebKit/Source/core/paint/ClipPathClipper.h

+// Copyright 2016 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 ClipPathClipper_h
+#define ClipPathClipper_h
+
+#include "core/paint/SVGClipPainter.h"
+#include "platform/graphics/paint/ClipPathRecorder.h"
+#include "wtf/Optional.h"
+
+namespace blink {
+
+class FloatPoint;
+class FloatRect;
+class GraphicsContext;
+class LayoutSVGResourceClipper;
+class LayoutObject;
+
+class ClipPathClipper {
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
+public:
+    ClipPathClipper(
+        GraphicsContext&,
+        const LayoutObject&,
+        const FloatRect& referenceBox,
+        const FloatRect& visualOverflowRect,
+        const FloatPoint& origin);
+    ~ClipPathClipper();
+
+private:
+    LayoutSVGResourceClipper* m_resourceClipper;
+    Optional<ClipPathRecorder> m_clipPathRecorder;
+    SVGClipPainter::ClipperState m_clipperState;
+    const LayoutObject& m_layoutObject;
+    GraphicsContext& m_context;
+};
+
+} // namespace blink
+
+#endif // ClipPathClipper_h