Add plumbing for font-stretch

Source/core/css/resolver/FontBuilder.cpp

 /*
  * 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 356 matching lines @@
     scope.fontDescription().setWeight(scope.fontDescription().bolderWeight());
 }
 
 void FontBuilder::setWeightLighter()
 {
     FontDescriptionChangeScope scope(this);
 
     scope.fontDescription().setWeight(scope.fontDescription().lighterWeight());
 }
 
+void FontBuilder::setStretch(FontStretch fontStretch)
+{
+    FontDescriptionChangeScope scope(this);
+
+    scope.fontDescription().setStretch(fontStretch);
+}
+
 void FontBuilder::setFontVariantLigaturesInitial()
 {
     FontDescriptionChangeScope scope(this);
 
     scope.fontDescription().setCommonLigaturesState(FontDescription::NormalLigaturesState);
     scope.fontDescription().setDiscretionaryLigaturesState(FontDescription::NormalLigaturesState);
     scope.fontDescription().setHistoricalLigaturesState(FontDescription::NormalLigaturesState);
     scope.fontDescription().setContextualLigaturesState(FontDescription::NormalLigaturesState);
 }
 
@@ skipping 290 matching lines @@
     FontOrientation fontOrientation;
     NonCJKGlyphOrientation glyphOrientation;
     getFontAndGlyphOrientation(documentStyle, fontOrientation, glyphOrientation);
     fontDescription.setOrientation(fontOrientation);
     fontDescription.setNonCJKGlyphOrientation(glyphOrientation);
     documentStyle->setFontDescription(fontDescription);
     documentStyle->font().update(fontSelector);
 }
 
 }