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diff --git a/third_party/libwebrtc/test/testsupport/perf_test_result_writer.h b/third_party/libwebrtc/test/testsupport/perf_test_result_writer.h
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+++ b/third_party/libwebrtc/test/testsupport/perf_test_result_writer.h
@@ -0,0 +1,58 @@
+/*
+ *  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_TESTSUPPORT_PERF_TEST_RESULT_WRITER_H_
+#define TEST_TESTSUPPORT_PERF_TEST_RESULT_WRITER_H_
+
+#include <stdio.h>
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "test/testsupport/perf_test.h"
+
+namespace webrtc {
+namespace test {
+
+// Interface for classes that write perf results to some kind of JSON format.
+class PerfTestResultWriter {
+ public:
+  virtual ~PerfTestResultWriter() = default;
+
+  virtual void ClearResults() = 0;
+  virtual void LogResult(absl::string_view graph_name,
+                         absl::string_view trace_name,
+                         double value,
+                         absl::string_view units,
+                         bool important,
+                         webrtc::test::ImproveDirection improve_direction) = 0;
+  virtual void LogResultMeanAndError(
+      absl::string_view graph_name,
+      absl::string_view trace_name,
+      double mean,
+      double error,
+      absl::string_view units,
+      bool important,
+      webrtc::test::ImproveDirection improve_direction) = 0;
+  virtual void LogResultList(
+      absl::string_view graph_name,
+      absl::string_view trace_name,
+      rtc::ArrayView<const double> values,
+      absl::string_view units,
+      bool important,
+      webrtc::test::ImproveDirection improve_direction) = 0;
+
+  virtual std::string Serialize() const = 0;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TESTSUPPORT_PERF_TEST_RESULT_WRITER_H_