Factor painting code for filters out of FilterEffectRenderer into FilterPainter.

Source/core/paint/FilterPainter.h

+// Copyright 2014 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 FilterPainter_h
+#define FilterPainter_h
+
+#include "core/rendering/LayerPaintingInfo.h"
+#include "wtf/OwnPtr.h"
+
+namespace blink {
+
+class ClipRecorder;
+class ClipRect;
+class FloatRect;
+class GraphicsContext;
+class RenderLayer;
+
+class FilterPainter {
+public:
+    FilterPainter(RenderLayer&, GraphicsContext*, const FloatRect& filterBoxRect, const ClipRect&, const LayerPaintingInfo&, PaintLayerFlags paintFlags);
+    ~FilterPainter();
+
+private:
+    bool m_filterInProgress;
+    GraphicsContext* m_context;
+    OwnPtr<ClipRecorder> m_clipRecorder;
+};
+
+} // namespace blink
+
+#endif // FilterPainter_h