Generate enum/getters/setters/mappings for line-break.

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 2417 matching lines @@
       name_for_methods: "HyphenationString",
       field_template: "external",
       type_name: "AtomicString",
       include_paths: ["platform/wtf/text/AtomicString.h"],
       default_value: "AtomicString()",
       field_group: "rare-inherited",
     },
     {
       name: "-webkit-line-break",
       inherited: true,
-      field_template: "storage_only",
+      field_template: "keyword",
       type_name: "LineBreak",
-      default_value: "LineBreak::kAuto",
-      field_size: 3,
+      keywords: ["auto", "loose", "normal", "strict", "after-white-space"],
+      default_value: "auto",
       field_group: "rare-inherited",
     },
     {
       name: "-webkit-line-clamp",
       api_class: true,
       api_methods: ["parseSingleValue"],
       type_name: "LineClampValue",
     },
     {
       name: "-webkit-margin-after-collapse",
@@ skipping 1073 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }