Implement parseShorthand API for shorthand properties, "overflow", "font" and "font-variant"

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

Index: third_party/WebKit/Source/core/css/CSSProperties.json5
diff --git a/third_party/WebKit/Source/core/css/CSSProperties.json5 b/third_party/WebKit/Source/core/css/CSSProperties.json5
index b29df314586805c7ad29152a71aa0432f18836db..7c7527408c9ebff185f581128a42d94eab4cca85 100644
--- a/third_party/WebKit/Source/core/css/CSSProperties.json5
+++ b/third_party/WebKit/Source/core/css/CSSProperties.json5
@@ -3608,10 +3608,14 @@
     {
       name: "font",
       longhands: "font-style;font-variant-ligatures;font-variant-caps;font-variant-numeric;font-weight;font-stretch;font-size;line-height;font-family",
+      api_class: true,
+      api_methods: ["parseShorthand"],
     },
     {
       name: "font-variant",
       longhands: "font-variant-ligatures;font-variant-caps;font-variant-numeric",
+      api_class: true,
+      api_methods: ["parseShorthand"],
       is_descriptor: true,
     },
     {
@@ -3682,6 +3686,8 @@
     {
       name: "overflow",
       longhands: "overflow-x;overflow-y",
+      api_class: true,
+      api_methods: ["parseShorthand"],
     },
     {
       name: "padding",