CSS Motion Path: Implement animation for the offset-path property

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 1308 matching lines @@
     },
     {
       name: "offset-distance",
       api_class: true,
       converter: "convertLength",
       interpolable: true,
     },
     {
       name: "offset-path",
       converter: "convertPathOrNone",
+      interpolable: true,
     },
     {
       name: "offset-position",
       api_class: true,
       api_methods: ["parseSingleValue"],
       converter: "convertPositionOrAuto",
       interpolable: true,
       runtime_flag: "CSSOffsetPositionAnchor",
     },
     {
@@ skipping 1734 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }