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diff --git a/third_party/libwebrtc/pc/peer_connection_message_handler.h b/third_party/libwebrtc/pc/peer_connection_message_handler.h
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+++ b/third_party/libwebrtc/pc/peer_connection_message_handler.h
@@ -0,0 +1,62 @@
+/*
+ *  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.
+ */
+
+#ifndef PC_PEER_CONNECTION_MESSAGE_HANDLER_H_
+#define PC_PEER_CONNECTION_MESSAGE_HANDLER_H_
+
+#include <functional>
+
+#include "api/jsep.h"
+#include "api/media_stream_interface.h"
+#include "api/peer_connection_interface.h"
+#include "api/rtc_error.h"
+#include "api/stats_types.h"
+#include "pc/legacy_stats_collector_interface.h"
+#include "rtc_base/message_handler.h"
+#include "rtc_base/thread.h"
+#include "rtc_base/thread_message.h"
+
+namespace webrtc {
+
+class CreateSessionDescriptionObserver;
+class SetSessionDescriptionObserver;
+class StatsCollectorInterface;
+class StatsObserver;
+class MediaStreamTrackInterface;
+
+class PeerConnectionMessageHandler : public rtc::MessageHandler {
+ public:
+  explicit PeerConnectionMessageHandler(rtc::Thread* signaling_thread)
+      : signaling_thread_(signaling_thread) {}
+  ~PeerConnectionMessageHandler();
+
+  // Implements MessageHandler.
+  void OnMessage(rtc::Message* msg) override;
+  void PostSetSessionDescriptionSuccess(
+      SetSessionDescriptionObserver* observer);
+  void PostSetSessionDescriptionFailure(SetSessionDescriptionObserver* observer,
+                                        RTCError&& error);
+  void PostCreateSessionDescriptionFailure(
+      CreateSessionDescriptionObserver* observer,
+      RTCError error);
+  void PostGetStats(StatsObserver* observer,
+                    LegacyStatsCollectorInterface* legacy_stats,
+                    MediaStreamTrackInterface* track);
+  void RequestUsagePatternReport(std::function<void()>, int delay_ms);
+
+ private:
+  rtc::Thread* signaling_thread() const { return signaling_thread_; }
+
+  rtc::Thread* const signaling_thread_;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_PEER_CONNECTION_MESSAGE_HANDLER_H_