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

Source/core/layout/line/BreakingContextInlineHeaders.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 24 matching lines @@
 #include "core/layout/line/InlineTextBox.h"
 #include "core/layout/line/LayoutTextInfo.h"
 #include "core/layout/line/LineBreaker.h"
 #include "core/layout/line/LineInfo.h"
 #include "core/layout/line/LineWidth.h"
 #include "core/layout/line/TrailingObjects.h"
 #include "core/layout/line/WordMeasurement.h"
 #include "core/layout/svg/LayoutSVGInlineText.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "platform/text/TextBreakIterator.h"
+#include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 // We don't let our line box tree for a single line get any deeper than this.
 const unsigned cMaxLineDepth = 200;
 
 class BreakingContext {
+    STACK_ALLOCATED();
 public:
     BreakingContext(InlineBidiResolver& resolver, LineInfo& inLineInfo, LineWidth& lineWidth, LayoutTextInfo& inLayoutTextInfo, FloatingObject* inLastFloatFromPreviousLine, bool appliedStartWidth, LineLayoutBlockFlow block)
         : m_resolver(resolver)
         , m_current(resolver.position())
         , m_lineBreak(resolver.position())
         , m_block(block)
         , m_lastObject(m_current.object())
         , m_nextObject(nullptr)
         , m_currentStyle(nullptr)
         , m_blockStyle(block.style())
@@ skipping 847 matching lines @@
 
     if (style.textIndentType() == TextIndentHanging)
         shouldIndentText = shouldIndentText == IndentText ? DoNotIndentText : IndentText;
 
     return shouldIndentText;
 }
 
 }
 
 #endif // BreakingContextInlineHeaders_h