passing layout context and getting local reference from it

Summary: We are passing layout context from yoga as event data for Layout Pass End event and it is being then used to get the local reference of node so that we can pass it as method parameter to java layer

Reviewed By: davidaurelio

Differential Revision: D15619640

fbshipit-source-id: 5f6c29d9e6acb73a8d87f8e0cb1577d35a271aeb

java/BUCK

@@ -13,8 +13,8 @@ CXX_LIBRARY_WHITELIST_FOR_TESTS = CXX_LIBRARY_WHITELIST + [
 yoga_cxx_library(
     name = "jni",
     srcs = glob(["jni/*.cpp"]),
-    headers = glob(["jni/*.h"]),
-    header_namespace = "",
+    header_namespace = "yoga/java",
+    exported_headers = glob(["jni/*.h"]),
     allow_jni_merging = True,
     compiler_flags = [
         "-fno-omit-frame-pointer",