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+// Copyright 2019 The Amber Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SAMPLES_TIMESTAMP_H_
+#define SAMPLES_TIMESTAMP_H_
+
+#include "amber/amber.h"
+
+namespace timestamp {
+
+/// Return a timestamp in nanoseconds.
+uint64_t SampleGetTimestampNs();
+
+}  // namespace timestamp
+
+#endif  // SAMPLES_TIMESTAMP_H_