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

Source/core/paint/SVGContainerPainter.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 SVGContainerPainter_h
 #define SVGContainerPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
 class LayoutSVGContainer;
 
 class SVGContainerPainter {
+    STACK_ALLOCATED();
 public:
     SVGContainerPainter(LayoutSVGContainer& layoutSVGContainer) : m_layoutSVGContainer(layoutSVGContainer) { }
 
     void paint(const PaintInfo&);
 
 private:
     LayoutSVGContainer& m_layoutSVGContainer;
 };
 
 } // namespace blink
 
 #endif // SVGContainerPainter_h