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

Source/core/paint/FrameSetPainter.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 FrameSetPainter_h
 #define FrameSetPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 class IntRect;
 struct PaintInfo;
 class LayoutFrameSet;
 class LayoutPoint;
 
 class FrameSetPainter {
+    STACK_ALLOCATED();
 public:
     FrameSetPainter(LayoutFrameSet& layoutFrameSet) : m_layoutFrameSet(layoutFrameSet) { }
 
     void paint(const PaintInfo&, const LayoutPoint& paintOffset);
 
 private:
     void paintBorders(const PaintInfo&, const LayoutPoint& adjustedPaintOffset);
     void paintChildren(const PaintInfo&, const LayoutPoint& adjustedPaintOffset);
     void paintRowBorder(const PaintInfo&, const IntRect&);
     void paintColumnBorder(const PaintInfo&, const IntRect&);
 
     LayoutFrameSet& m_layoutFrameSet;
 };
 
 } // namespace blink
 
 #endif // FrameSetPainter_h