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diff --git a/third_party/libwebrtc/test/logging/file_log_writer.h b/third_party/libwebrtc/test/logging/file_log_writer.h
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+++ b/third_party/libwebrtc/test/logging/file_log_writer.h
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+/*
+ *  Copyright 2019 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_LOGGING_FILE_LOG_WRITER_H_
+#define TEST_LOGGING_FILE_LOG_WRITER_H_
+
+#include <cstdio>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "test/logging/log_writer.h"
+
+namespace webrtc {
+namespace webrtc_impl {
+class FileLogWriter final : public RtcEventLogOutput {
+ public:
+  explicit FileLogWriter(absl::string_view file_path);
+  ~FileLogWriter() final;
+  bool IsActive() const override;
+  bool Write(absl::string_view value) override;
+  void Flush() override;
+
+ private:
+  std::FILE* const out_;
+};
+}  // namespace webrtc_impl
+class FileLogWriterFactory final : public LogWriterFactoryInterface {
+ public:
+  explicit FileLogWriterFactory(absl::string_view base_path);
+  ~FileLogWriterFactory() final;
+
+  std::unique_ptr<RtcEventLogOutput> Create(
+      absl::string_view filename) override;
+
+ private:
+  const std::string base_path_;
+  std::vector<std::unique_ptr<webrtc_impl::FileLogWriter>> writers_;
+};
+
+}  // namespace webrtc
+
+#endif  // TEST_LOGGING_FILE_LOG_WRITER_H_