Add plumbing for font-stretch

Source/core/css/resolver/FontBuilder.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. 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 44 matching lines @@
     void setFontFamilyInherit(const FontDescription&);
     void setFontFamilyValue(CSSValue*, float effectiveZoom);
 
     void setFontSizeInitial(float effectiveZoom);
     void setFontSizeInherit(const FontDescription&, float effectiveZoom);
     void setFontSizeValue(CSSValue*, RenderStyle* parentStyle, const RenderStyle* rootElementStyle, float effectiveZoom);
 
     void setWeight(FontWeight);
     void setWeightBolder();
     void setWeightLighter();
+    void setStretch(FontStretch);
 
     void setFontVariantLigaturesInitial();
     void setFontVariantLigaturesInherit(const FontDescription&);
     void setFontVariantLigaturesValue(CSSValue*);
 
     void setFeatureSettingsNormal();
     void setFeatureSettingsValue(CSSValue*);
 
     void setScript(const String& locale);
     void setItalic(FontItalic);
@@ skipping 48 matching lines @@
     // object on RenderStyle from various other font-related
     // properties on RenderStyle. Whenever one of those
     // is changed, FontBuilder tracks the need to update
     // style->font() with this bool.
     bool m_fontDirty;
 };
 
 }
 
 #endif