Add Android code to the 0.11-stable branch.

Cherry-picked https://github.com/facebook/react-native/commit/42eb5464fd8a65ed84b799de5d4dc225349449be

ReactAndroid/src/main/java/com/facebook/csslayout/CSSFlexDirection.java

@@ -0,0 +1,19 @@
+/**
+ * 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.
+ */
+
+// NOTE: this file is auto-copied from https://github.com/facebook/css-layout
+// @generated SignedSource<<6183a87290f3acd1caef7b6301bbf3a7>>
+
+package com.facebook.csslayout;
+
+public enum CSSFlexDirection {
+  COLUMN,
+  COLUMN_REVERSE,
+  ROW,
+  ROW_REVERSE
+}