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 4488382919d226c5377c2183a8c72c7c3519c0de..14292271df1a4aaed88e3f99d0cc6942112003e0 100644
--- a/third_party/WebKit/Source/core/css/CSSProperties.json5
+++ b/third_party/WebKit/Source/core/css/CSSProperties.json5
@@ -3635,10 +3635,14 @@
     {
       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,
     },
     {
@@ -3709,6 +3713,8 @@
     {
       name: "overflow",
       longhands: "overflow-x;overflow-y",
+      api_class: true,
+      api_methods: ["parseShorthand"],
     },
     {
       name: "padding",