Manual resync of moved fbjni files

lib/fb/src/main/cpp/include/jni/LocalReference.h

@@ -0,0 +1,37 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <memory>
+#include <type_traits>
+
+#include <jni.h>
+
+#include <fb/Environment.h>
+
+namespace facebook {
+namespace jni {
+
+template<class T>
+struct LocalReferenceDeleter {
+  static_assert(std::is_convertible<T, jobject>::value,
+    "LocalReferenceDeleter<T> instantiated with type that is not convertible to jobject");
+  void operator()(T localReference) {
+    if (localReference != nullptr) {
+      Environment::current()->DeleteLocalRef(localReference);
+    }
+  } 
+ };
+
+template<class T>
+using LocalReference =
+  std::unique_ptr<typename std::remove_pointer<T>::type, LocalReferenceDeleter<T>>;
+
+} }