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diff --git a/third-party/benchmark/src/counter.h b/third-party/benchmark/src/counter.h
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+++ b/third-party/benchmark/src/counter.h
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+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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 BENCHMARK_COUNTER_H_
+#define BENCHMARK_COUNTER_H_
+
+#include "benchmark/benchmark.h"
+
+namespace benchmark {
+
+// these counter-related functions are hidden to reduce API surface.
+namespace internal {
+void Finish(UserCounters* l, IterationCount iterations, double time,
+            double num_threads);
+void Increment(UserCounters* l, UserCounters const& r);
+bool SameNames(UserCounters const& l, UserCounters const& r);
+}  // end namespace internal
+
+}  // end namespace benchmark
+
+#endif  // BENCHMARK_COUNTER_H_