Proof of concept that CSSPropertyAPI*::parseSingleValue may need more tahn 2 arguments

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 177 matching lines @@
 -webkit-writing-mode inherited, custom_value, type_name=WritingMode, priority=High
 text-rendering inherited, font, type_name=TextRenderingMode, priority=High
 zoom custom_all, api_class, priority=High
 
 align-content initial=initialContentAlignment, converter=convertContentAlignmentData
 align-items initial=initialDefaultAlignment, converter=convertSelfOrDefaultAlignmentData
 alignment-baseline svg
 align-self initial=initialSelfAlignment, converter=convertSelfOrDefaultAlignmentData
 backdrop-filter interpolable, converter=convertFilterOperations, runtime_flag=CSSBackdropFilter
 backface-visibility
-background-attachment custom_all
-background-blend-mode custom_all
-background-clip custom_all
+background-attachment custom_all, api_class=CSSPropertyAPIBackgroundComponent
+background-blend-mode custom_all, api_class=CSSPropertyAPIBackgroundComponent
+background-clip custom_all, api_class=CSSPropertyAPIBackgroundComponent
 background-color interpolable, custom_all
-background-image interpolable, custom_all, typedom_types=[Image], keywords=[auto]
-background-origin custom_all
-background-position-x interpolable, custom_all
-background-position-y interpolable, custom_all
+background-image interpolable, custom_all, typedom_types=[Image], keywords=[auto], api_class=CSSPropertyAPIBackgroundComponent
+background-origin custom_all, api_class=CSSPropertyAPIBackgroundComponent
+background-position-x interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
+background-position-y interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
 background-repeat-x custom_all
 background-repeat-y custom_all
-background-size interpolable, custom_all
+background-size interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
 baseline-shift interpolable, svg, custom_inherit, custom_value
 border-bottom-color interpolable, custom_all
 border-bottom-left-radius interpolable, initial=initialBorderRadius, converter=convertRadius, api_class=CSSPropertyAPIBorderRadius
 border-bottom-right-radius interpolable, initial=initialBorderRadius, converter=convertRadius, api_class=CSSPropertyAPIBorderRadius
 border-bottom-style type_name=EBorderStyle, initial=initialBorderStyle
 border-bottom-width interpolable, initial=initialBorderWidth, converter=convertLineWidth<unsigned>
 border-collapse inherited, independent, keyword_only, keywords=[separate|collapse], initial_keyword=separate
 border-image-outset interpolable, custom_all
 border-image-repeat custom_all
 border-image-slice interpolable, custom_all
@@ skipping 78 matching lines @@
 list-style-position inherited, independent, keyword_only, keywords=[outside|inside], initial_keyword=outside
 list-style-type inherited, keyword_only, keywords=[disc|circle|square|decimal|decimal-leading-zero|arabic-indic|bengali|cambodian|khmer|devanagari|gujarati|gurmukhi|kannada|lao|malayalam|mongolian|myanmar|oriya|persian|urdu|telugu|tibetan|thai|lower-roman|upper-roman|lower-greek|lower-alpha|lower-latin|upper-alpha|upper-latin|cjk-earthly-branch|cjk-heavenly-stem|ethiopic-halehame|ethiopic-halehame-am|ethiopic-halehame-ti-er|ethiopic-halehame-ti-et|hangul|hangul-consonant|korean-hangul-formal|korean-hanja-formal|korean-hanja-informal|hebrew|armenian|lower-armenian|upper-armenian|georgian|cjk-ideographic|simp-chinese-formal|simp-chinese-informal|trad-chinese-formal|trad-chinese-informal|hiragana|katakana|hiragana-iroha|katakana-iroha|none], initial_keyword=disc
 margin-bottom interpolable, initial=initialMargin, converter=convertQuirkyLength
 margin-left interpolable, initial=initialMargin, converter=convertQuirkyLength
 margin-right interpolable, initial=initialMargin, converter=convertQuirkyLength
 margin-top interpolable, initial=initialMargin, converter=convertQuirkyLength
 marker-end inherited, svg, name_for_methods=MarkerEndResource, converter=convertFragmentIdentifier
 marker-mid inherited, svg, name_for_methods=MarkerMidResource, converter=convertFragmentIdentifier
 marker-start inherited, svg, name_for_methods=MarkerStartResource, converter=convertFragmentIdentifier
 mask svg, name_for_methods=MaskerResource, converter=convertFragmentIdentifier
-mask-source-type runtime_flag=CSSMaskSourceType, custom_all
+mask-source-type runtime_flag=CSSMaskSourceType, custom_all, api_class=CSSPropertyAPIBackgroundComponent
 mask-type svg
 max-height interpolable, initial=initialMaxSize, converter=convertLengthMaxSizing
 max-width interpolable, initial=initialMaxSize, converter=convertLengthMaxSizing
 min-height interpolable, initial=initialMinSize, converter=convertLengthSizing
 min-width interpolable, initial=initialMinSize, converter=convertLengthSizing
 mix-blend-mode type_name=blink::WebBlendMode, name_for_methods=BlendMode
 motion-offset alias_for=offset-distance
 motion-path alias_for=offset-path
 motion-rotation alias_for=offset-rotation
 object-fit type_name=ObjectFit
@@ skipping 81 matching lines @@
 rotate runtime_flag=CSSIndependentTransformProperties, converter=convertRotate, interpolable, api_class
 scale runtime_flag=CSSIndependentTransformProperties, converter=convertScale, interpolable, api_class
 unicode-bidi type_name=UnicodeBidi, keyword_only, keywords=[normal|embed|bidi-override|isolate|plaintext|isolate-override], initial_keyword=normal, field_storage_type=platform/text/UnicodeBidi
 vector-effect svg
 vertical-align interpolable, custom_inherit, custom_value, api_class
 visibility interpolable, inherited, independent, keyword_only, keywords=[visible|hidden|collapse], initial_keyword=visible
 x interpolable, svg, converter=convertLength
 y interpolable, svg, converter=convertLength
 -webkit-appearance type_name=ControlPart
 -webkit-app-region custom_all
--webkit-background-clip use_handlers_for=CSSPropertyBackgroundClip
--webkit-background-origin use_handlers_for=CSSPropertyBackgroundOrigin
+-webkit-background-clip use_handlers_for=CSSPropertyBackgroundClip, api_class=CSSPropertyAPIBackgroundComponent
+-webkit-background-origin use_handlers_for=CSSPropertyBackgroundOrigin, api_class=CSSPropertyAPIBackgroundComponent
 -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
@@ skipping 13 matching lines @@
 -webkit-line-clamp type_name=LineClampValue, api_class
 -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
 -webkit-mask-box-image-outset interpolable, custom_all
 -webkit-mask-box-image-repeat custom_all
 -webkit-mask-box-image-slice interpolable, custom_all
 -webkit-mask-box-image-source interpolable, custom_value
 -webkit-mask-box-image-width interpolable, custom_all
--webkit-mask-clip custom_all
--webkit-mask-composite custom_all
--webkit-mask-image interpolable, custom_all
--webkit-mask-origin custom_all
--webkit-mask-position-x interpolable, custom_all
--webkit-mask-position-y interpolable, custom_all
+-webkit-mask-clip custom_all, api_class=CSSPropertyAPIBackgroundComponent
+-webkit-mask-composite custom_all, api_class=CSSPropertyAPIBackgroundComponent
+-webkit-mask-image interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
+-webkit-mask-origin custom_all, api_class=CSSPropertyAPIBackgroundComponent
+-webkit-mask-position-x interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
+-webkit-mask-position-y interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
 -webkit-mask-repeat-x custom_all
 -webkit-mask-repeat-y custom_all
--webkit-mask-size interpolable, custom_all
+-webkit-mask-size interpolable, custom_all, api_class=CSSPropertyAPIBackgroundComponent
 -webkit-perspective-origin-x interpolable, converter=convertLength
 -webkit-perspective-origin-y interpolable, converter=convertLength
 -webkit-print-color-adjust inherited, independent, keyword_only, keywords=[economy|exact], initial_keyword=economy
 -webkit-rtl-ordering inherited, independent, type_name=EOrder, setter=setRtlOrdering, initial=initialRtlOrdering, keyword_only, keywords=[logical|visual], initial_keyword=logical
 -webkit-ruby-position inherited, type_name=RubyPosition
 -webkit-tap-highlight-color inherited, converter=convertColor
 -webkit-text-combine inherited, type_name=TextCombine, name_for_methods=TextCombine
 -webkit-text-emphasis-color inherited, custom_all
 -webkit-text-emphasis-position inherited, type_name=TextEmphasisPosition
 -webkit-text-emphasis-style inherited, custom_all, api_class
@@ skipping 192 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