Generate methods for Hyphens and HyphenationString in ComputedStyleBase.

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 1254 matching lines @@
       field_template: "external",
       include_paths: ["platform/Length.h"],
       type_name: "Length",
       field_group: "box",
       default_value: "Length()",
     },
     {
       name: "hyphens",
       inherited: true,
       runtime_flag: "CSSHyphens",
-      field_template: "storage_only",
+      field_template: "keyword",
       type_name: "Hyphens",
-      default_value: "Hyphens::kManual",
-      field_size: 2,
+      keywords: ["none", "manual", "auto"],
+      default_value: "manual",
       field_group: "rare-inherited",
     },
     {
       name: "image-rendering",
       inherited: true,
       field_template: "storage_only",
       type_name: "EImageRendering",
       default_value: "EImageRendering::kAuto",
       field_size: 3,
       field_group: "rare-inherited",
@@ skipping 1128 matching lines @@
       type_name: "AtomicString",
       include_paths: ["platform/wtf/text/AtomicString.h"],
       default_value: "g_null_atom",
       field_group: "rare-inherited",
     },
     {
       name: "-webkit-hyphenate-character",
       converter: "ConvertString<CSSValueAuto>",
       inherited: true,
       name_for_methods: "HyphenationString",
-      field_template: "storage_only",
+      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",
       type_name: "LineBreak",
@@ skipping 1085 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }