Moved overflow-anchor property to be generated 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 1251 matching lines @@
     },
     {
       name: "outline-width",
       api_class: true,
       converter: "convertLineWidth<unsigned short>",
       interpolable: true,
     },
     {
       name: "overflow-anchor",
       runtime_flag: "ScrollAnchoring",
-      type_name: "EOverflowAnchor",
+      inherited: false,
+      initial_keyword: "auto",
+      keyword_only: true,
+      keywords: [
+        "visible", "none", "auto",
+      ],

[sashab, 2017/01/27 21:58:16]

Ahhh these patches are so much ncer now ~^_^~

Are we still in json5 land? cant find CSSProperties.json5 on codesearch. Maybe
its out of date

     },
     {
       name: "overflow-wrap",
       inherited: true,
     },
     {
       name: "overflow-x",
       type_name: "EOverflow",
     },
     {
@@ skipping 1521 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }