Implements CSSPropertyAPI for the fragmentation element properties.

third_party/WebKit/Source/core/css/CSSProperties.in

 // This file specifies all the CSS properties we support and the necessary
 // information for our code generation. The various supported arguments
 // are described below with example usage
 
 
 // - alias_for=other-property
 // Properties specifying alias_for should be virtually identical to the
 // properties they alias. Minor parsing differences are allowed as long as
 // the CSSValues created are of the same format of the aliased property.
 
@@ skipping 306 matching lines @@
 object-fit type_name=ObjectFit
 object-position interpolable, converter=convertPosition
 offset-anchor runtime_flag=CSSOffsetPositionAnchor, interpolable, converter=convertPositionOrAuto
 offset-distance interpolable, converter=convertLength
 offset-path converter=convertPathOrNone
 offset-position runtime_flag=CSSOffsetPositionAnchor, interpolable, converter=convertPositionOrAuto, api_class
 offset-rotate runtime_flag=CSSOffsetRotate, interpolable, converter=convertOffsetRotate
 offset-rotation runtime_flag=CSSOffsetRotation, interpolable, converter=convertOffsetRotate
 opacity interpolable, type_name=float
 order type_name=int
-orphans interpolable, inherited, type_name=short
+orphans interpolable, inherited, type_name=short, api_class=CSSPropertyAPIBoxGroup
 outline-color interpolable, custom_all
 outline-offset interpolable, converter=convertComputedLength<int>, api_class
 outline-style custom_all
 outline-width interpolable, converter=convertLineWidth<unsigned short>
 overflow-anchor runtime_flag=ScrollAnchoring, type_name=EOverflowAnchor
 overflow-wrap inherited
 overflow-x type_name=EOverflow
 overflow-y type_name=EOverflow
 padding-bottom interpolable, initial=initialPadding, converter=convertLength
 padding-left interpolable, initial=initialPadding, converter=convertLength
@@ skipping 72 matching lines @@
 -webkit-background-origin use_handlers_for=CSSPropertyBackgroundOrigin
 -webkit-border-horizontal-spacing interpolable, inherited, name_for_methods=HorizontalBorderSpacing, converter=convertComputedLength<short>
 -webkit-border-image initial=initialNinePieceImage, custom_value
 -webkit-border-vertical-spacing interpolable, inherited, name_for_methods=VerticalBorderSpacing, converter=convertComputedLength<short>
 -webkit-box-align type_name=EBoxAlignment
 -webkit-box-decoration-break
 -webkit-box-direction inherited, independent, keyword_only, keywords=[normal|reverse], initial_keyword=normal
 -webkit-box-flex type_name=float
 -webkit-box-flex-group type_name=unsigned int, api_class
 -webkit-box-lines
--webkit-box-ordinal-group type_name=unsigned int
+-webkit-box-ordinal-group type_name=unsigned int, api_class=CSSPropertyAPIBoxGroup
 -webkit-box-orient
 -webkit-box-pack
 -webkit-box-reflect converter=convertBoxReflect
 column-count interpolable, type_name=unsigned short, custom_all
 column-gap interpolable, converter=convertComputedLength<float>, custom_all, api_class
 column-rule-color interpolable, custom_all
 column-rule-style type_name=EBorderStyle, initial=initialBorderStyle
 column-rule-width interpolable, converter=convertLineWidth<unsigned short>
 column-span type_name=ColumnSpan
 column-width interpolable, converter=convertComputedLength<float>, custom_all
@@ skipping 33 matching lines @@
 -webkit-text-security inherited
 -webkit-text-stroke-color interpolable, inherited, custom_all
 -webkit-text-stroke-width inherited, converter=convertTextStrokeWidth
 -webkit-transform-origin-x interpolable, converter=convertLength
 -webkit-transform-origin-y interpolable, converter=convertLength
 -webkit-transform-origin-z interpolable, converter=convertComputedLength<float>, api_class
 -webkit-user-drag
 -webkit-user-modify inherited
 user-select inherited
 white-space inherited, independent, keyword_only, keywords=[normal|pre|pre-wrap|pre-line|nowrap|-webkit-nowrap], initial_keyword=normal
-widows interpolable, inherited, type_name=short
+widows interpolable, inherited, type_name=short, api_class=CSSPropertyAPIBoxGroup
 width interpolable, initial=initialSize, converter=convertLengthSizing, typedom_types=[Length], keywords=[auto], supports_percentage
 will-change custom_all, api_class
 word-break inherited
 word-spacing interpolable, inherited, initial=initialLetterWordSpacing, converter=convertSpacing
 // UAs must treat 'word-wrap' as an alternate name for the 'overflow-wrap' property. So using the same handlers.
 word-wrap inherited, name_for_methods=OverflowWrap
 z-index interpolable, type_name=int, custom_all, api_class
 
 // CSS logical props
 inline-size direction_aware
@@ skipping 170 matching lines @@
 -webkit-text-size-adjust alias_for=text-size-adjust
 -webkit-transform alias_for=transform
 -webkit-transform-origin alias_for=transform-origin
 -webkit-transform-style alias_for=transform-style
 -webkit-transition alias_for=transition
 -webkit-transition-delay alias_for=transition-delay
 -webkit-transition-duration alias_for=transition-duration
 -webkit-transition-property alias_for=transition-property
 -webkit-transition-timing-function alias_for=transition-timing-function
 -webkit-user-select alias_for=user-select