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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_EXTRAS_TIME_H_
+#define LIB_EXTRAS_TIME_H_
+
+// OS-specific function for timing.
+
+namespace jxl {
+
+// Returns current time [seconds] from a monotonic clock with unspecified
+// starting point - only suitable for computing elapsed time.
+double Now();
+
+} // namespace jxl
+
+#endif // LIB_EXTRAS_TIME_H_