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diff --git a/third_party/libwebrtc/api/rtc_event_log_output.h b/third_party/libwebrtc/api/rtc_event_log_output.h
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+++ b/third_party/libwebrtc/api/rtc_event_log_output.h
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+/*
+ *  Copyright (c) 2017 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 API_RTC_EVENT_LOG_OUTPUT_H_
+#define API_RTC_EVENT_LOG_OUTPUT_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+
+// NOTE: This class is still under development and may change without notice.
+class RtcEventLogOutput {
+ public:
+  virtual ~RtcEventLogOutput() = default;
+
+  // An output normally starts out active, though that might not always be
+  // the case (e.g. failed to open a file for writing).
+  // Once an output has become inactive (e.g. maximum file size reached), it can
+  // never become active again.
+  virtual bool IsActive() const = 0;
+
+  // Write encoded events to an output. Returns true if the output was
+  // successfully written in its entirety. Otherwise, no guarantee is given
+  // about how much data was written, if any. The output sink becomes inactive
+  // after the first time `false` is returned. Write() may not be called on
+  // an inactive output sink.
+  virtual bool Write(absl::string_view output) = 0;
+
+  // Indicates that buffers should be written to disk if applicable.
+  virtual void Flush() {}
+};
+
+}  // namespace webrtc
+
+#endif  // API_RTC_EVENT_LOG_OUTPUT_H_