Chrome not considering Underline Position from Font

Source/platform/fonts/mac/SimpleFontDataMac.mm

 /*
  * Copyright (C) 2005, 2006, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 195 matching lines @@
     // such fonts meant the same distance, but in the reverse direction.
     iDescent = -abs(CGFontGetDescent(m_platformData.cgFont()));
     iLineGap = CGFontGetLeading(m_platformData.cgFont());
     unitsPerEm = CGFontGetUnitsPerEm(m_platformData.cgFont());
 
     float pointSize = m_platformData.m_size;
     float ascent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;
     float descent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;
     float lineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;
     float underlineThickness = CTFontGetUnderlineThickness(m_platformData.ctFont());
+    float underlinePosition = CTFontGetUnderlinePosition(m_platformData.ctFont());
 
     // We need to adjust Times, Helvetica, and Courier to closely match the
     // vertical metrics of their Microsoft counterparts that are the de facto
     // web standard. The AppKit adjustment of 20% is too big and is
     // incorrectly added to line spacing, so we use a 15% adjustment instead
     // and add it to the ascent.
     NSString *familyName = [m_platformData.font() familyName];
     if ([familyName isEqualToString:@"Times"] || [familyName isEqualToString:@"Helvetica"] || [familyName isEqualToString:@"Courier"])
         ascent += floorf(((ascent + descent) * 0.15f) + 0.5f);
 
@@ skipping 23 matching lines @@
             xHeight = scaleEmToUnits(CGFontGetXHeight(m_platformData.cgFont()), unitsPerEm) * pointSize;
     } else
         xHeight = verticalRightOrientationFontData()->fontMetrics().xHeight();
 
     m_fontMetrics.setUnitsPerEm(unitsPerEm);
     m_fontMetrics.setAscent(ascent);
     m_fontMetrics.setDescent(descent);
     m_fontMetrics.setLineGap(lineGap);
     m_fontMetrics.setXHeight(xHeight);
     m_fontMetrics.setUnderlineThickness(underlineThickness);
+    m_fontMetrics.setUnderlinePosition(underlinePosition);
 }
 
 static CFDataRef copyFontTableForTag(FontPlatformData& platformData, FourCharCode tableName)
 {
     return CGFontCopyTableForTag(platformData.cgFont(), tableName);
 }
 
 void SimpleFontData::platformCharWidthInit()
 {
     m_avgCharWidth = 0;
@@ skipping 168 matching lines @@
         RetainPtr<CGFontRef> runCGFont(AdoptCF, CTFontCopyGraphicsFont(runFont, 0));
         if (!CFEqual(runCGFont.get(), cgFont.get()))
             return false;
     }
 
     addResult.storedValue->value = true;
     return true;
 }
 
 } // namespace WebCore