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diff --git a/third_party/libwebrtc/test/peer_scenario/scenario_connection.h b/third_party/libwebrtc/test/peer_scenario/scenario_connection.h
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+++ b/third_party/libwebrtc/test/peer_scenario/scenario_connection.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 TEST_PEER_SCENARIO_SCENARIO_CONNECTION_H_
+#define TEST_PEER_SCENARIO_SCENARIO_CONNECTION_H_
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "api/candidate.h"
+#include "api/jsep.h"
+#include "p2p/base/transport_description.h"
+#include "test/network/network_emulation_manager.h"
+#include "test/scoped_key_value_config.h"
+
+namespace webrtc {
+
+// ScenarioIceConnection provides the transport level functionality of a
+// PeerConnection for use in peer connection scenario tests. This allows
+// implementing custom server side behavior in tests.
+class ScenarioIceConnection {
+ public:
+  class IceConnectionObserver {
+   public:
+    // Called on network thread.
+    virtual void OnPacketReceived(rtc::CopyOnWriteBuffer packet) = 0;
+    // Called on signaling thread.
+    virtual void OnIceCandidates(
+        const std::string& mid,
+        const std::vector<cricket::Candidate>& candidates) = 0;
+
+   protected:
+    ~IceConnectionObserver() = default;
+  };
+  static std::unique_ptr<ScenarioIceConnection> Create(
+      test::NetworkEmulationManagerImpl* net,
+      IceConnectionObserver* observer);
+
+  virtual ~ScenarioIceConnection() = default;
+
+  // Posts tasks to send packets to network thread.
+  virtual void SendRtpPacket(rtc::ArrayView<const uint8_t> packet_view) = 0;
+  virtual void SendRtcpPacket(rtc::ArrayView<const uint8_t> packet_view) = 0;
+
+  // Used for ICE configuration, called on signaling thread.
+  virtual void SetRemoteSdp(SdpType type, const std::string& remote_sdp) = 0;
+  virtual void SetLocalSdp(SdpType type, const std::string& local_sdp) = 0;
+
+  virtual EmulatedEndpoint* endpoint() = 0;
+  virtual const cricket::TransportDescription& transport_description()
+      const = 0;
+
+  webrtc::test::ScopedKeyValueConfig field_trials;
+};
+
+}  // namespace webrtc
+
+#endif  // TEST_PEER_SCENARIO_SCENARIO_CONNECTION_H_