Make font-related CSS properties less custom.

Source/core/css/CSSProperties.in

 // FIXME: When we have all the properties using the new StyleBuilder, we
 //   should use this for make_css_property_names.py
 // Note: Mandatory blank line to skip parameter parsing phase
 
 align-content
 background-attachment custom_all
 background-blend-mode custom_all
 background-clip custom_all
 background-color custom_all
 background-image custom_all
@@ skipping 38 matching lines @@
 direction custom_value
 display custom_inherit, custom_value
 empty-cells type_name=EEmptyCell
 flex-basis type_name=Length, converter=convertLengthOrAuto
 flex-direction
 flex-grow type_name=float
 flex-shrink type_name=float
 flex-wrap
 float type_name=EFloat, name_for_methods=Floating
 font-family custom_all
-font-kerning custom_all
+font-kerning font, type_name=FontDescription::Kerning, name_for_methods=Kerning
 font-size custom_all
-font-style custom_all
-font-variant custom_all
+font-style font, type_name=FontItalic, name_for_methods=Italic
+font-variant font, type_name=FontSmallCaps, name_for_methods=SmallCaps
 font-variant-ligatures custom_all
 font-weight custom_all
 grid-auto-flow type_name=GridAutoFlow
 height type_name=Length, initial=initialSize, converter=convertLengthSizing
 justify-content
 image-rendering
 isolation
 left type_name=Length, initial=initialOffset, converter=convertLengthOrAuto
 letter-spacing type_name=float, initial=initialLetterWordSpacing, converter=convertSpacing
 line-height getter=specifiedLineHeight, custom_value
@@ skipping 45 matching lines @@
 tab-size type_name=unsigned
 text-align custom_value
 text-align-last type_name=TextAlignLast
 text-decoration custom_value
 text-decoration-line use_handlers_for=CSSPropertyTextDecoration
 text-decoration-color custom_all
 text-decoration-style type_name=TextDecorationStyle
 text-indent custom_all
 text-justify type_name=TextJustify
 text-overflow type_name=TextOverflow
-text-rendering custom_all
+text-rendering font, type_name=TextRenderingMode
 text-shadow converter=convertShadow
 text-transform
 top type_name=Length, initial=initialOffset, converter=convertLengthOrAuto
 touch-action type_name=TouchAction, custom_value
 touch-action-delay type_name=TouchActionDelay, initial=initialTouchActionDelay
 unicode-bidi
 vertical-align custom_value
 visibility
 white-space
 widows type_name=short, custom_all
@@ skipping 42 matching lines @@
 -webkit-column-break-inside type_name=EPageBreak, initial=initialPageBreak
 -webkit-column-count type_name=unsigned short, custom_all
 column-fill type_name=ColumnFill
 -webkit-column-gap type_name=float, custom_all
 -webkit-column-progression type_name=ColumnProgression
 -webkit-column-rule-color custom_all
 -webkit-column-rule-style type_name=EBorderStyle, initial=initialBorderStyle
 -webkit-column-rule-width type_name=unsigned short, converter=convertLineWidth<unsigned short>
 -webkit-column-span type_name=ColumnSpan
 -webkit-column-width type_name=float, custom_all
--webkit-font-smoothing custom_all
+-webkit-font-smoothing font, type_name=FontSmoothingMode
 -webkit-highlight type_name=AtomicString, converter=convertString<CSSValueNone>
 -webkit-hyphenate-character type_name=AtomicString, name_for_methods=HyphenationString, converter=convertString<CSSValueAuto>
 -webkit-line-break type_name=LineBreak
 -webkit-line-clamp type_name=LineClampValue
 -webkit-margin-after-collapse type_name=EMarginCollapse
 -webkit-margin-before-collapse type_name=EMarginCollapse
 -webkit-margin-bottom-collapse type_name=EMarginCollapse, name_for_methods=MarginAfterCollapse
 -webkit-margin-top-collapse type_name=EMarginCollapse, name_for_methods=MarginBeforeCollapse
 -internal-marquee-direction type_name=EMarqueeDirection, name_for_methods=MarqueeDirection
 -internal-marquee-increment custom_value, name_for_methods=MarqueeIncrement
@@ skipping 64 matching lines @@
 stop-opacity svg, type_name=float, converter=convertNumberOrPercentage
 stroke-dashoffset svg, type_name=SVGLength, name_for_methods=StrokeDashOffset, converter=convertSVGLength
 stroke-linecap svg, type_name=LineCap, name_for_methods=CapStyle
 stroke-linejoin svg, type_name=LineJoin, name_for_methods=JoinStyle
 stroke-miterlimit svg, type_name=float, name_for_methods=StrokeMiterLimit
 stroke-opacity svg, type_name=float, converter=convertNumberOrPercentage
 stroke-width svg, type_name=SVGLength, converter=convertSVGLength
 text-anchor svg
 vector-effect svg
 writing-mode svg, type_name=SVGWritingMode