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

Source/core/paint/TextPainter.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 TextPainter_h
 #define TextPainter_h
 
 #include "core/CoreExport.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "platform/fonts/TextBlob.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/transforms/AffineTransform.h"
+#include "wtf/Allocator.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class ComputedStyle;
 class Font;
 class GraphicsContext;
 class GraphicsContextStateSaver;
 class LayoutTextCombine;
 class LayoutObject;
 struct PaintInfo;
 class ShadowList;
 class TextRun;
 struct TextRunPaintInfo;
 
 class CORE_EXPORT TextPainter {
+    STACK_ALLOCATED();
 public:
     struct Style;
 
     TextPainter(GraphicsContext*, const Font&, const TextRun&, const LayoutPoint& textOrigin, const LayoutRect& textBounds, bool horizontal);
     ~TextPainter();
 
     void setEmphasisMark(const AtomicString&, TextEmphasisPosition);
     void setCombinedText(LayoutTextCombine* combinedText) { m_combinedText = combinedText; }
 
     static void updateGraphicsContext(GraphicsContext*, const Style&, bool horizontal, GraphicsContextStateSaver&);
 
     void paint(int startOffset, int endOffset, int length, const Style&, TextBlobPtr* cachedTextBlob = 0);
 
     struct Style {
+        STACK_ALLOCATED();
         Color currentColor;
         Color fillColor;
         Color strokeColor;
         Color emphasisMarkColor;
         float strokeWidth;
         const ShadowList* shadow;
 
         bool operator==(const Style& other)
         {
             return currentColor == other.currentColor
@@ skipping 51 matching lines @@
     // 5. Therefore the translation from (3) to (4) is (x(), y()) - (-maxY(), x()) = (x() + maxY(), y() - x())
 
     // A similar argument derives the counter-clockwise case.
     return rotationDirection == Clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.y() - boxRect.x())
         : AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.y(), boxRect.x() + boxRect.maxY());
 }
 
 } // namespace blink
 
 #endif // TextPainter_h