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diff --git a/third_party/libwebrtc/rtc_base/log_sinks.h b/third_party/libwebrtc/rtc_base/log_sinks.h
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+++ b/third_party/libwebrtc/rtc_base/log_sinks.h
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+/*
+ *  Copyright 2015 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 RTC_BASE_LOG_SINKS_H_
+#define RTC_BASE_LOG_SINKS_H_
+
+#include <stddef.h>
+
+#include <memory>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/file_rotating_stream.h"
+#include "rtc_base/logging.h"
+
+namespace rtc {
+
+// Log sink that uses a FileRotatingStream to write to disk.
+// Init() must be called before adding this sink.
+class FileRotatingLogSink : public LogSink {
+ public:
+  // `num_log_files` must be greater than 1 and `max_log_size` must be greater
+  // than 0.
+  FileRotatingLogSink(absl::string_view log_dir_path,
+                      absl::string_view log_prefix,
+                      size_t max_log_size,
+                      size_t num_log_files);
+  ~FileRotatingLogSink() override;
+
+  FileRotatingLogSink(const FileRotatingLogSink&) = delete;
+  FileRotatingLogSink& operator=(const FileRotatingLogSink&) = delete;
+
+  // Writes the message to the current file. It will spill over to the next
+  // file if needed.
+  void OnLogMessage(const std::string& message) override;
+  void OnLogMessage(absl::string_view message) override;
+  void OnLogMessage(const std::string& message,
+                    LoggingSeverity sev,
+                    const char* tag) override;
+  void OnLogMessage(absl::string_view message,
+                    LoggingSeverity sev,
+                    const char* tag) override;
+
+  // Deletes any existing files in the directory and creates a new log file.
+  virtual bool Init();
+
+  // Disables buffering on the underlying stream.
+  bool DisableBuffering();
+
+ protected:
+  explicit FileRotatingLogSink(FileRotatingStream* stream);
+
+ private:
+  std::unique_ptr<FileRotatingStream> stream_;
+};
+
+// Log sink that uses a CallSessionFileRotatingStream to write to disk.
+// Init() must be called before adding this sink.
+class CallSessionFileRotatingLogSink : public FileRotatingLogSink {
+ public:
+  CallSessionFileRotatingLogSink(absl::string_view log_dir_path,
+                                 size_t max_total_log_size);
+  ~CallSessionFileRotatingLogSink() override;
+
+  CallSessionFileRotatingLogSink(const CallSessionFileRotatingLogSink&) =
+      delete;
+  CallSessionFileRotatingLogSink& operator=(
+      const CallSessionFileRotatingLogSink&) = delete;
+};
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_LOG_SINKS_H_