Add property mapping for borderStyle from JS to RCTView (iOS)

Reviewed By: nicklockwood

Differential Revision: D2540321

fb-gh-sync-id: 57316f7b8dc734ee784179dbfde83e6034827819

React/Views/RCTBorderStyle.h

@@ -0,0 +1,17 @@
+/**
+ * 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+typedef NS_ENUM(NSInteger, RCTBorderStyle) {
+  RCTBorderStyleUnset = 0,
+  RCTBorderStyleSolid,
+  RCTBorderStyleDotted,
+  RCTBorderStyleDashed,
+};