Implement CSS: scroll-boundary-behavior

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 2091 matching lines @@
       name: "scroll-behavior",
       runtime_flag: "CSSOMSmoothScroll",
       type_name: "ScrollBehavior",
       field_template: "storage_only",
       field_group: "rare-non-inherited",
       field_size: 2, // FIXME: Convert this to a keyword field
       default_value: "kScrollBehaviorAuto",
       default_generated_functions: ["getter", "setter"],
     },
     {
+      name: "scroll-boundary-behavior-x",
+      default_value: "auto",
+      field_template: "keyword",
+      keywords: ["auto", "contain", "none"],
+      type_name: "EScrollBoundaryBehavior",
+      runtime_flag: "CSSScrollBoundaryBehavior",
+    },
+    {
+      name: "scroll-boundary-behavior-y",
+      default_value: "auto",
+      field_template: "keyword",
+      keywords: ["auto", "contain", "none"],
+      type_name: "EScrollBoundaryBehavior",
+      runtime_flag: "CSSScrollBoundaryBehavior",
+    },
+    {
       name: "scroll-snap-type",
       api_class: true,
       api_methods: ["parseSingleValue"],
       converter: "ConvertSnapType",
       getter: "GetScrollSnapType",
       runtime_flag: "CSSScrollSnapPoints",
       field_template: "external",
       type_name: "ScrollSnapType",
       field_group: "rare-non-inherited->scroll-snap",
       include_paths: ["core/style/ScrollSnap.h"],
@@ skipping 1700 matching lines @@
       api_class: true,
       api_methods: ["parseShorthand"],
     },
     {
       name: "overflow",
       longhands: ["overflow-x", "overflow-y"],
       api_class: true,
       api_methods: ["parseShorthand"],
     },
     {
+      name: "scroll-boundary-behavior",
+      longhands: ["scroll-boundary-behavior-x", "scroll-boundary-behavior-y"],
+      runtime_flag: "CSSScrollBoundaryBehavior",
+    },
+    {
       name: "padding",
       longhands: ["padding-top", "padding-right", "padding-bottom", "padding-left"],
     },
     {
       name: "page-break-after",
       longhands: ["break-after"],
     },
     {
       name: "page-break-before",
       longhands: ["break-before"],
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     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }