Expose box sizing getters and setters in Yoga (#1701)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1701

X-link: https://github.com/facebook/react-native/pull/46630

I would like to write some tests for box sizing that will drive a lot of my development as I implement content box. To do that, I need this publicly exposed. Obviously not that ideal since this currently does not do anything. Maybe we can name the value in such a way that its clear it is in development?

Changelog: [Internal]

Reviewed By: NickGerleman

Differential Revision: D63135970

fbshipit-source-id: 7520823bf925364eae45341531e012e80ec92284

javascript/src/generated/YGEnums.ts

@@ -19,6 +19,11 @@ export enum Align {
   SpaceEvenly = 8,
 }
 
+export enum BoxSizing {
+  ContentBox = 0,
+  BorderBox = 1,
+}
+
 export enum Dimension {
   Width = 0,
   Height = 1,
@@ -137,6 +142,8 @@ const constants = {
   ALIGN_SPACE_BETWEEN: Align.SpaceBetween,
   ALIGN_SPACE_AROUND: Align.SpaceAround,
   ALIGN_SPACE_EVENLY: Align.SpaceEvenly,
+  BOX_SIZING_CONTENT_BOX: BoxSizing.ContentBox,
+  BOX_SIZING_BORDER_BOX: BoxSizing.BorderBox,
   DIMENSION_WIDTH: Dimension.Width,
   DIMENSION_HEIGHT: Dimension.Height,
   DIRECTION_INHERIT: Direction.Inherit,