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diff --git a/third_party/libwebrtc/pc/legacy_stats_collector_interface.h b/third_party/libwebrtc/pc/legacy_stats_collector_interface.h
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+++ b/third_party/libwebrtc/pc/legacy_stats_collector_interface.h
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+/*
+ *  Copyright 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.
+ */
+
+// This file contains an interface for the (obsolete) StatsCollector class that
+// is used by compilation units that do not wish to depend on the StatsCollector
+// implementation.
+
+#ifndef PC_LEGACY_STATS_COLLECTOR_INTERFACE_H_
+#define PC_LEGACY_STATS_COLLECTOR_INTERFACE_H_
+
+#include <stdint.h>
+
+#include "api/legacy_stats_types.h"
+#include "api/media_stream_interface.h"
+
+namespace webrtc {
+
+class LegacyStatsCollectorInterface {
+ public:
+  virtual ~LegacyStatsCollectorInterface() {}
+
+  // Adds a local audio track that is used for getting some voice statistics.
+  virtual void AddLocalAudioTrack(AudioTrackInterface* audio_track,
+                                  uint32_t ssrc) = 0;
+
+  // Removes a local audio tracks that is used for getting some voice
+  // statistics.
+  virtual void RemoveLocalAudioTrack(AudioTrackInterface* audio_track,
+                                     uint32_t ssrc) = 0;
+  virtual void GetStats(MediaStreamTrackInterface* track,
+                        StatsReports* reports) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_LEGACY_STATS_COLLECTOR_INTERFACE_H_