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diff --git a/third_party/libwebrtc/test/explicit_key_value_config.h b/third_party/libwebrtc/test/explicit_key_value_config.h
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+++ b/third_party/libwebrtc/test/explicit_key_value_config.h
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+/*
+ *  Copyright (c) 2020 The WebRTC 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 in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef TEST_EXPLICIT_KEY_VALUE_CONFIG_H_
+#define TEST_EXPLICIT_KEY_VALUE_CONFIG_H_
+
+#include <functional>
+#include <map>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "api/field_trials_registry.h"
+
+namespace webrtc {
+namespace test {
+
+class ExplicitKeyValueConfig : public FieldTrialsRegistry {
+ public:
+  explicit ExplicitKeyValueConfig(absl::string_view s);
+
+ private:
+  std::string GetValue(absl::string_view key) const override;
+
+  // Unlike std::less<std::string>, std::less<> is transparent and allows
+  // heterogeneous lookup directly with absl::string_view.
+  std::map<std::string, std::string, std::less<>> key_value_map_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_EXPLICIT_KEY_VALUE_CONFIG_H_