Generate subgroup StyleSurroundData in ComputedStyle.

third_party/WebKit/Source/core/css/CSSProperties.json5

 {
 // 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
 
   parameters: {
     // - 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 43 matching lines @@
     // in the .h file for this property, and also used in CSSPropertyAPIFiles.h.tmpl to
     // generate declarations for only the methods this property has implementations for.
     api_methods: {
       default: [],
       valid_type: "list",
        // This list must be an ordered, complete list of methods whose names match those
        // defined in CSSPropertyDescriptor.h.
       valid_values: ["parseSingleValue", "parseShorthand"],
     },
 
+    // - field_group
+    // Name of the group that this field belongs to. Fields in the same group are stored
+    // together as a nested class inside ComputedStyle and dynamically allocated on use.
+    // Leave this out if the field is stored directly on ComputedStyle.
+    field_group: {
+      value_type: "str"
+    },
+
     // - field_template
     // Affects how the interface to this field is generated.
     // TODO(sashab, meade): Remove this once TypedOM types are specified for
     // every property, since this value can be inferred from that.
     field_template: {
       valid_values: [
         // Field is stored as an enum and has a initial/getter/setter/resetter.
         "keyword",
         // Field stores a primitive value like int/bool. The type is specified by
         // type_name. The interface has a initial/getter/setter/resetter.
@@ skipping 715 matching lines @@
     },
     {
       name: "bottom",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLengthOrAuto",
       interpolable: true,
       keywords: ["auto"],
       supports_percentage: true,
       typedom_types: ["Length"],
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length()",
     },
     {
       name: "box-shadow",
       converter: "ConvertShadowList",
       interpolable: true,
     },
     "box-sizing",
     {
       name: "break-after",
       // Storage for this property also covers these legacy properties:
@@ skipping 382 matching lines @@
     },
     {
       name: "left",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLengthOrAuto",
       interpolable: true,
       keywords: ["auto"],
       supports_percentage: true,
       typedom_types: ["Length"],
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length()",
     },
     {
       name: "letter-spacing",
       api_class: "CSSPropertyAPILetterAndWordSpacing",
       api_methods: ["parseSingleValue"],
       converter: "ConvertSpacing",
       inherited: true,
       initial: "InitialLetterWordSpacing",
       interpolable: true,
     },
@@ skipping 47 matching lines @@
       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",
       ],
     },
     {
       name: "margin-bottom",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertQuirkyLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "margin-left",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertQuirkyLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "margin-right",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertQuirkyLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "margin-top",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertQuirkyLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "marker-end",
       api_class: "CSSPropertyAPIMarker",
       converter: "ConvertFragmentIdentifier",
       inherited: true,
       name_for_methods: "MarkerEndResource",
       svg: true,
     },
     {
@@ skipping 202 matching lines @@
         "visible", "hidden", "scroll", "auto", "overlay", "-webkit-paged-x", "-webkit-paged-y",
       ],
       type_name: "EOverflow",
     },
     {
       name: "padding-bottom",
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "padding-left",
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "padding-right",
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "padding-top",
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
       interpolable: true,
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length(kFixed)",
     },
     {
       name: "paint-order",
       api_class: true,
       api_methods: ["parseSingleValue"],
       converter: "ConvertPaintOrder",
       inherited: true,
       svg: true,
     },
     {
@@ skipping 40 matching lines @@
     },
     {
       name: "right",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLengthOrAuto",
       interpolable: true,
       keywords: ["auto"],
       supports_percentage: true,
       typedom_types: ["Length"],
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length()",
     },
     {
       name: "r",
       api_class: "CSSPropertyAPIStrokeOrLength",
       converter: "ConvertLength",
       interpolable: true,
       svg: true,
     },
     {
       name: "rx",
@@ skipping 298 matching lines @@
     },
     {
       name: "top",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLengthOrAuto",
       interpolable: true,
       keywords: ["auto"],
       supports_percentage: true,
       typedom_types: ["Length"],
+      field_template: "external",
+      field_type_path: "platform/Length",
+      field_group: "surround",
+      default_value: "Length()",
     },
     {
       name: "touch-action",
       api_class: true,
       api_methods: ["parseSingleValue"],
       converter: "ConvertFlags<TouchAction>",
       type_name: "TouchAction",
     },
     {
       name: "transform",
@@ skipping 1261 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }