Use LayoutUnit for all border-*-width logic

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 684 matching lines @@
     },
     {
       name: "border-bottom-width",
       api_class: "CSSPropertyAPIBorderWidth",
       converter: "ConvertLineWidth<float>",
       initial: "InitialBorderWidth",
       interpolable: true,
       keywords: ["thin", "medium", "thick"],
       typedom_types: ["Length"],
       field_template: "storage_only",
-      type_name: "unsigned",
-      field_size : 26,
-      default_value: "WidthToFixedPoint(3)",
+      field_type_path: "core/style/BorderWidth",
+      default_value: "BorderWidth()",
       field_group: "surround",
     },
     {
       name: "border-collapse",
       independent: true,
       inherited: true,
       default_value: "separate",
       field_template: "keyword",
       keywords: ["separate", "collapse"],
     },
@@ skipping 49 matching lines @@
     },
     {
       name: "border-left-width",
       api_class: "CSSPropertyAPIBorderWidth",
       converter: "ConvertLineWidth<float>",
       initial: "InitialBorderWidth",
       interpolable: true,
       keywords: ["thin", "medium", "thick"],
       typedom_types: ["Length"],
       field_template: "storage_only",
-      type_name: "unsigned",
-      field_size : 26,
-      default_value: "WidthToFixedPoint(3)",
+      field_type_path: "core/style/BorderWidth",
+      default_value: "BorderWidth()",
       field_group: "surround",
     },
     {
       name: "border-right-color",
       custom_all: true,
       interpolable: true,
       field_template: "storage_only",
       field_type_path: "platform/graphics/Color",
       default_value: "0",
       field_group: "surround",
     },
     {
       name: "border-right-style",
       type_name: "EBorderStyle",
       typedom_types: ["Image"],
       field_template: "keyword",
       default_value: "none",
       keywords: ["none", "hidden", "inset", "groove", "outset", "ridge", "dotted", "dashed", "solid", "double"],
       field_group: "surround",
     },
     {
       name: "border-right-width",
       api_class: "CSSPropertyAPIBorderWidth",
       converter: "ConvertLineWidth<float>",
       initial: "InitialBorderWidth",
       interpolable: true,
       keywords: ["thin", "medium", "thick"],
       typedom_types: ["Length"],
       field_template: "storage_only",
-      type_name: "unsigned",
-      field_size : 26,
-      default_value: "WidthToFixedPoint(3)",
+      field_type_path: "core/style/BorderWidth",
+      default_value: "BorderWidth()",
       field_group: "surround",
     },
     {
       name: "border-top-color",
       custom_all: true,
       interpolable: true,
       field_template: "storage_only",
       field_type_path: "platform/graphics/Color",
       default_value: "0",
       field_group: "surround",
@@ skipping 32 matching lines @@
     {
       name: "border-top-width",
       api_class: "CSSPropertyAPIBorderWidth",
       converter: "ConvertLineWidth<float>",
       initial: "InitialBorderWidth",
       interpolable: true,
       keywords: ["thin", "medium", "thick"],
       supports_percentage: true,
       typedom_types: ["Length"],
       field_template: "storage_only",
-      type_name: "unsigned",
-      field_size : 26,
-      default_value: "WidthToFixedPoint(3)",
+      field_type_path: "core/style/BorderWidth",
+      default_value: "BorderWidth()",
       field_group: "surround",
     },
     {
       name: "bottom",
       api_class: "CSSPropertyAPIMargin",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLengthOrAuto",
       interpolable: true,
       keywords: ["auto"],
       supports_percentage: true,
@@ skipping 2466 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }