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diff --git a/third_party/libwebrtc/api/test/stats_observer_interface.h b/third_party/libwebrtc/api/test/stats_observer_interface.h
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+++ b/third_party/libwebrtc/api/test/stats_observer_interface.h
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+/*
+ *  Copyright (c) 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 API_TEST_STATS_OBSERVER_INTERFACE_H_
+#define API_TEST_STATS_OBSERVER_INTERFACE_H_
+
+#include "absl/strings/string_view.h"
+#include "api/stats/rtc_stats_report.h"
+
+namespace webrtc {
+namespace webrtc_pc_e2e {
+
+// API is in development and can be changed without notice.
+class StatsObserverInterface {
+ public:
+  virtual ~StatsObserverInterface() = default;
+
+  // Method called when stats reports are available for the PeerConnection
+  // identified by `pc_label`.
+  virtual void OnStatsReports(
+      absl::string_view pc_label,
+      const rtc::scoped_refptr<const RTCStatsReport>& report) = 0;
+};
+
+}  // namespace webrtc_pc_e2e
+}  // namespace webrtc
+
+#endif  // API_TEST_STATS_OBSERVER_INTERFACE_H_