Move viewport unit resolution to style recalc time

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 65 matching lines @@
     void setTextRenderingMode(TextRenderingMode);
     void setKerning(FontDescription::Kerning);
     void setFontSmoothing(FontSmoothingMode);
 
     // FIXME: These need to just vend a Font object eventually.
     void createFont(PassRefPtr<FontSelector>, const RenderStyle* parentStyle, RenderStyle*);
     // FIXME: This is nearly static, should either made fully static or decomposed into
     // FontBuilder calls at the callsite.
     void createFontForDocument(PassRefPtr<FontSelector>, RenderStyle*);
 
+    bool fontSizeHasViewportUnits() { return m_fontSizehasViewportUnits; }
+
     // FIXME: These should not be necessary eventually.
     void setFontDirty(bool fontDirty) { m_fontDirty = fontDirty; }
     // FIXME: This is only used by an ASSERT in StyleResolver. Remove?
     bool fontDirty() const { return m_fontDirty; }
 
     friend class FontDescriptionChangeScope;
 private:
 
     // FIXME: "size" arg should be first for consistency with other similar functions.
     void setSize(FontDescription&, float effectiveZoom, float size);
     void checkForOrientationChange(RenderStyle*);
     // This function fixes up the default font size if it detects that the current generic font family has changed. -dwh
     void checkForGenericFamilyChange(RenderStyle*, const RenderStyle* parentStyle);
     void checkForZoomChange(RenderStyle*, const RenderStyle* parentStyle);
 
     float getComputedSizeFromSpecifiedSize(FontDescription&, float effectiveZoom, float specifiedSize);
 
     const Document* m_document;
     bool m_useSVGZoomRules;
+    bool m_fontSizehasViewportUnits;
     // FIXME: This member is here on a short-term lease. The plan is to remove
     // any notion of RenderStyle from here, allowing FontBuilder to build Font objects
     // directly, rather than as a byproduct of calling RenderStyle::setFontDescription.
     // FontDescriptionChangeScope should be the only consumer of this member.
     // If you're using it, U R DOIN IT WRONG.
     RenderStyle* m_style;
 
     // Fontbuilder is responsbile for creating the Font()
     // 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