Add internal experiments API

Summary: Adds internal API that we can use to conduct experiments.

Reviewed By: SidharthGuglani

Differential Revision: D16340463

fbshipit-source-id: 07a8bb7dbc4a02c5c95f1ad29b18845ab43752cf

yoga/internal/experiments-inl.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+#pragma once
+
+#include "experiments.h"
+
+#include <bitset>
+
+namespace facebook {
+namespace yoga {
+namespace internal {
+
+namespace detail {
+extern std::bitset<sizeof(int)> enabledExperiments;
+} // namespace detail
+
+inline bool isEnabled(Experiment experiment) {
+  return detail::enabledExperiments.test(static_cast<size_t>(experiment));
+}
+
+inline void disableAllExperiments() {
+  detail::enabledExperiments = 0;
+}
+
+} // namespace internal
+} // namespace yoga
+} // namespace facebook