Update gentest to account for box sizing (#1700)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1700

tsia, need to teach gentest to write box sizing now.

Reviewed By: NickGerleman

Differential Revision: D63138372

fbshipit-source-id: 29072b3e602fe77edb14a8857a83e5bba4c92205

gentest/gentest-java.js

@@ -184,6 +184,9 @@ JavaEmitter.prototype = Object.create(Emitter.prototype, {
   YGWrapWrap: {value: 'YogaWrap.WRAP'},
   YGWrapWrapReverse: {value: 'YogaWrap.WRAP_REVERSE'},
 
+  YGBoxSizingBorderBox: {value: 'YogaBoxSizing.BORDER_BOX'},
+  YGBoxSizingContentBox: {value: 'YogaBoxSizing.CONTENT_BOX'},
+
   YGNodeCalculateLayout: {
     value: function (node, dir, _experiments) {
       this.push(node + '.setDirection(' + dir + ');');
@@ -473,6 +476,12 @@ JavaEmitter.prototype = Object.create(Emitter.prototype, {
     },
   },
 
+  YGNodeStyleSetBoxSizing: {
+    value: function (nodeName, value) {
+      this.push(nodeName + '.setBoxSizing(' + toValueJava(value) + ');');
+    },
+  },
+
   YGNodeSetMeasureFunc: {
     value: function (nodeName, innerText) {
       this.push(`${nodeName}.setData("${innerText}");`);