Rename default -> initial style and use singletons.

Source/core/layout/style/LayoutStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * 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 52 matching lines @@
         unsigned m_bitfields[2];
     } inherited_flags;
 
     struct NonInheritedFlags {
         unsigned m_bitfields[2];
     } noninherited_flags;
 };
 
 static_assert(sizeof(LayoutStyle) == sizeof(SameSizeAsLayoutStyle), "LayoutStyle should stay small");
 
-inline LayoutStyle* defaultStyle()
-{
-    DEFINE_STATIC_REF(LayoutStyle, s_defaultStyle, (LayoutStyle::createDefaultStyle()));
-    return s_defaultStyle;
-}
-
 PassRefPtr<LayoutStyle> LayoutStyle::create()
 {
     return adoptRef(new LayoutStyle());
 }
 
-PassRefPtr<LayoutStyle> LayoutStyle::createDefaultStyle()
+PassRefPtr<LayoutStyle> LayoutStyle::createInitialStyle()
 {
-    return adoptRef(new LayoutStyle(DefaultStyle));
+    return adoptRef(new LayoutStyle(InitialStyle));
 }
 
 PassRefPtr<LayoutStyle> LayoutStyle::createAnonymousStyleWithDisplay(const LayoutStyle& parentStyle, EDisplay display)
 {
     RefPtr<LayoutStyle> newStyle = LayoutStyle::create();
     newStyle->inheritFrom(parentStyle);
     newStyle->inheritUnicodeBidiFrom(parentStyle);
     newStyle->setDisplay(display);
     return newStyle;
 }
 
 PassRefPtr<LayoutStyle> LayoutStyle::clone(const LayoutStyle& other)
 {
     return adoptRef(new LayoutStyle(other));
 }
 
 ALWAYS_INLINE LayoutStyle::LayoutStyle()
-    : m_box(defaultStyle()->m_box)
-    , visual(defaultStyle()->visual)
-    , m_background(defaultStyle()->m_background)
-    , surround(defaultStyle()->surround)
-    , rareNonInheritedData(defaultStyle()->rareNonInheritedData)
-    , rareInheritedData(defaultStyle()->rareInheritedData)
-    , inherited(defaultStyle()->inherited)
-    , m_svgStyle(defaultStyle()->m_svgStyle)
+    : m_box(initialStyle()->m_box)
+    , visual(initialStyle()->visual)
+    , m_background(initialStyle()->m_background)
+    , surround(initialStyle()->surround)
+    , rareNonInheritedData(initialStyle()->rareNonInheritedData)
+    , rareInheritedData(initialStyle()->rareInheritedData)
+    , inherited(initialStyle()->inherited)
+    , m_svgStyle(initialStyle()->m_svgStyle)
 {
     setBitDefaults(); // Would it be faster to copy this from the default style?
     static_assert((sizeof(InheritedFlags) <= 8), "InheritedFlags should not grow");
     static_assert((sizeof(NonInheritedFlags) <= 8), "NonInheritedFlags should not grow");
 }
 
-ALWAYS_INLINE LayoutStyle::LayoutStyle(DefaultStyleTag)
+ALWAYS_INLINE LayoutStyle::LayoutStyle(InitialStyleTag)
 {
     setBitDefaults();
 
     m_box.init();
     visual.init();
     m_background.init();
     surround.init();
     rareNonInheritedData.init();
     rareNonInheritedData.access()->m_deprecatedFlexibleBox.init();
     rareNonInheritedData.access()->m_flexibleBox.init();
@@ skipping 1592 matching lines @@
         horizontal || includeLogicalRightEdge);
 
     edges[BSLeft] = BorderEdge(borderLeftWidth(),
         visitedDependentColor(CSSPropertyBorderLeftColor),
         borderLeftStyle(),
         borderLeftIsTransparent(),
         !horizontal || includeLogicalLeftEdge);
 }
 
 } // namespace blink