Add option to use overflow: scroll in text fixtures

Summary: Wires up the option to use overflow: scroll in JS, Java, and CPP gentest fixtures.

Reviewed By: NickGerleman

Differential Revision: D50225803

fbshipit-source-id: f71c000b7143ad9e0e34d99e2d5ba2c6186266d1

gentest/gentest-cpp.js

@@ -122,6 +122,7 @@ CPPEmitter.prototype = Object.create(Emitter.prototype, {
 
   YGOverflowHidden: {value: 'YGOverflowHidden'},
   YGOverflowVisible: {value: 'YGOverflowVisible'},
+  YGOverflowScroll: {value: 'YGOverflowScroll'},
 
   YGPositionTypeAbsolute: {value: 'YGPositionTypeAbsolute'},
   YGPositionTypeRelative: {value: 'YGPositionTypeRelative'},

gentest/gentest-java.js

@@ -166,6 +166,7 @@ JavaEmitter.prototype = Object.create(Emitter.prototype, {
 
   YGOverflowHidden: {value: 'YogaOverflow.HIDDEN'},
   YGOverflowVisible: {value: 'YogaOverflow.VISIBLE'},
+  YGOverflowScroll: {value: 'YogaOverflow.SCROLL'},
 
   YGPositionTypeAbsolute: {value: 'YogaPositionType.ABSOLUTE'},
   YGPositionTypeRelative: {value: 'YogaPositionType.RELATIVE'},

gentest/gentest-javascript.js

@@ -151,6 +151,7 @@ JavascriptEmitter.prototype = Object.create(Emitter.prototype, {
 
   YGOverflowHidden: {value: 'Overflow.Hidden'},
   YGOverflowVisible: {value: 'Overflow.Visible'},
+  YGOverflowScroll: {value: 'Overflow.Scroll'},
 
   YGPositionTypeAbsolute: {value: 'PositionType.Absolute'},
   YGPositionTypeRelative: {value: 'PositionType.Relative'},

gentest/gentest.js

@@ -520,6 +520,8 @@ function overflowValue(e, value) {
       return e.YGOverflowVisible;
     case 'hidden':
       return e.YGOverflowHidden;
+    case 'scroll':
+      return e.YGOverflowScroll;
   }
 }