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diff --git a/third_party/libwebrtc/api/set_remote_description_observer_interface.h b/third_party/libwebrtc/api/set_remote_description_observer_interface.h
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+++ b/third_party/libwebrtc/api/set_remote_description_observer_interface.h
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+/*
+ *  Copyright 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_SET_REMOTE_DESCRIPTION_OBSERVER_INTERFACE_H_
+#define API_SET_REMOTE_DESCRIPTION_OBSERVER_INTERFACE_H_
+
+#include "api/rtc_error.h"
+#include "rtc_base/ref_count.h"
+
+namespace webrtc {
+
+// An observer for PeerConnectionInterface::SetRemoteDescription(). The
+// callback is invoked such that the state of the peer connection can be
+// examined to accurately reflect the effects of the SetRemoteDescription
+// operation.
+class SetRemoteDescriptionObserverInterface : public rtc::RefCountInterface {
+ public:
+  // On success, `error.ok()` is true.
+  virtual void OnSetRemoteDescriptionComplete(RTCError error) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_SET_REMOTE_DESCRIPTION_OBSERVER_INTERFACE_H_