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

Source/core/paint/ListItemPainter.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 ListItemPainter_h
 #define ListItemPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
 class Path;
 class LayoutListItem;
 class LayoutPoint;
 
 class ListItemPainter {
+    STACK_ALLOCATED();
 public:
     ListItemPainter(LayoutListItem& layoutListItem) : m_layoutListItem(layoutListItem) { }
 
     void paint(const PaintInfo&, const LayoutPoint& paintOffset);
 
 private:
     Path getCanonicalPath() const;
     Path getPath(const LayoutPoint& origin) const;
 
     LayoutListItem& m_layoutListItem;
 };
 
 } // namespace blink
 
 #endif // ListItemPainter_h