Add jni bindings

Summary: Add jni bindings for csslayout. First step in many of removing LayoutEngine.java and performing all layout in native.

Reviewed By: lucasr

Differential Revision: D3648793

fbshipit-source-id: d0e696e196fa7c63109c9117a65645ca3d6c9c00

java/com/facebook/proguard/annotations/BUCK

@@ -0,0 +1,17 @@
+# 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.
+
+include_defs('//CSSLAYOUT_DEFS')
+
+java_library(
+  name = 'annotations',
+  srcs = glob(['*.java']),
+  source = '1.7',
+  target = '1.7',
+  deps = [],
+  visibility = [CSSLAYOUT_ROOT],
+)