Store border-image-* on SurroundData in ComputedStyle

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

 {
 // This file specifies fields in ComputedStyle that we would like to
 // generate, but are not CSS properties.
 
   parameters: {
     // If the field has_custom_compare_and_copy, then it does not appear in
     // ComputedStyle::operator== and ComputedStyle::CopyNonInheritedFromCached.
     has_custom_compare_and_copy: {
       default: false,
     },
@@ skipping 172 matching lines @@
       type_name: "EVerticalAlign",
     },
     {
       name: "VerticalAlignLength",
       field_template: "storage_only",
       default_value: "Length()",
       field_type_path: "platform/Length",
       field_group: "box",
     },
     {
-      name: "border",
+      name: "border-image",
       field_template: "storage_only",
-      field_type_path: "core/style/BorderData",
+      field_type_path: "core/style/NinePieceImage",
       field_group: "surround",
-      default_value: "BorderData()",
+      default_value: "NinePieceImage()",
     },
     {
       name: "Background",
       field_template: "storage_only",
       field_type_path: "core/style/FillLayer",
       default_value: "FillLayer(kBackgroundFillLayer, true)",
       field_group: "background",
     },
     {
       name: "BackgroundColor",
@@ skipping 53 matching lines @@
     {
       name: "TextAutosizingMultiplier",
       inherited: true,
       field_template: "storage_only",
       type_name: "float",
       field_group: "inherited",
       default_value: "1.0",
     },
   ],
 }