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

Source/core/paint/BoxPainter.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 BoxPainter_h
 #define BoxPainter_h
 
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/paint/ObjectPainter.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class BackgroundImageGeometry;
 class FloatRoundedRect;
 class LayoutPoint;
 struct PaintInfo;
 class LayoutBox;
 class LayoutObject;
 
 class BoxPainter {
+    STACK_ALLOCATED();
 public:
     BoxPainter(LayoutBox& layoutBox) : m_layoutBox(layoutBox) { }
     void paint(const PaintInfo&, const LayoutPoint&);
 
     void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&);
     void paintMask(const PaintInfo&, const LayoutPoint&);
     void paintClippingMask(const PaintInfo&, const LayoutPoint&);
 
     typedef Vector<const FillLayer*, 8> FillLayerOcclusionOutputList;
     // Returns true if the result fill layers have non-associative blending or compositing mode.
@@ skipping 23 matching lines @@
 
     LayoutRect boundsForDrawingRecorder(const LayoutPoint& paintOffset);
 
     // FIXME: this should be const.
     LayoutBox& m_layoutBox;
 };
 
 } // namespace blink
 
 #endif