Make classes and structures in core/paint fast-allocated.

Source/core/paint/SVGShapePainter.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 SVGShapePainter_h
 #define SVGShapePainter_h
 
 #include "third_party/skia/include/core/SkPath.h"
+#include "wtf/Allocator.h"
 
 class SkPaint;
 
 namespace blink {
 
 class FloatRect;
 struct MarkerPosition;
 struct PaintInfo;
 class FloatPoint;
 class GraphicsContext;
 class LayoutSVGResourceMarker;
 class LayoutSVGShape;
 
 class SVGShapePainter {
+    STACK_ALLOCATED();
 public:
     SVGShapePainter(LayoutSVGShape& layoutSVGShape) : m_layoutSVGShape(layoutSVGShape) { }
 
     void paint(const PaintInfo&);
 
 private:
     void fillShape(GraphicsContext*, const SkPaint&, SkPath::FillType);
     void strokeShape(GraphicsContext*, const SkPaint&);
 
     void paintMarkers(const PaintInfo&, const FloatRect& boundingBox);
     void paintMarker(const PaintInfo&, LayoutSVGResourceMarker&, const MarkerPosition&, float);
     void strokeZeroLengthLineCaps(GraphicsContext*, const SkPaint&);
 
     LayoutSVGShape& m_layoutSVGShape;
 };
 
 } // namespace blink
 
 #endif // SVGShapePainter_h