add CoreEventTypes with LayoutEvent

Reviewed By: mhollweck

Differential Revision: D6554426

fbshipit-source-id: 856fcb8017682bc203fd69f5f4c93704816046ac

Author: sahrens

IntegrationTests/LayoutEventsTest.js

@@ -29,17 +29,7 @@ function debug(...args) {
   // console.log.apply(null, arguments);
 }
 
-type Layout = {
-  x: number;
-  y: number;
-  width: number;
-  height: number;
-};
-type LayoutEvent = {
-  nativeEvent: {
-    layout: Layout;
-  };
-};
+import type {Layout, LayoutEvent} from 'CoreEventTypes';
 type Style = {
   margin?: number,
   padding?: number,

Libraries/Types/CoreEventTypes.js

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2015-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.
+ *
+ * @providesModule CoreEventTypes
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+export type Layout = {
+  x: number,
+  y: number,
+  width: number,
+  height: number,
+};
+export type LayoutEvent = {
+  nativeEvent: {
+    layout: Layout,
+  },
+};