Bug 1024804 p1 - implement fallback for font-variant-position sub/superscript glyphs. r=jfkthame
Bug 1024804 p2 - scan scriptrun for characters lacking variant glyphs. r=jfkthame
Bug 1024804 p3 - reftests for subscript/superscript fallback. r=jfkthame
Bug 1024804 followup - replace gfxFont::CalculateSubSuperSizeAndOffset with gfxFontStyle::AdjustForSubSuperscript. r=jdaggett