Import new C source of truth css-layout

fbshipit-source-id: e866918d6c62fc1cf3a04c269f782b94db9b875a

java/com/facebook/csslayout/CSSOverflow.java

@@ -0,0 +1,15 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.csslayout;
+
+public enum CSSOverflow {
+  VISIBLE,
+  HIDDEN,
+}