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diff --git a/third_party/libwebrtc/test/peer_scenario/signaling_route.h b/third_party/libwebrtc/test/peer_scenario/signaling_route.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_SIGNALING_ROUTE_H_
+#define TEST_PEER_SCENARIO_SIGNALING_ROUTE_H_
+
+#include <string>
+#include <utility>
+
+#include "test/network/network_emulation_manager.h"
+#include "test/peer_scenario/peer_scenario_client.h"
+
+namespace webrtc {
+namespace test {
+
+// Helper class to reduce the amount of boilerplate required for ICE signalling
+// ad SDP negotiation.
+class SignalingRoute {
+ public:
+  SignalingRoute(PeerScenarioClient* caller,
+                 PeerScenarioClient* callee,
+                 CrossTrafficRoute* send_route,
+                 CrossTrafficRoute* ret_route);
+
+  void StartIceSignaling();
+
+  // The `modify_offer` callback is used to modify an offer after the local
+  // description has been set. This is legal (but odd) behavior.
+  // The `munge_offer` callback is used to modify an offer between its creation
+  // and set local description. This behavior is forbidden according to the spec
+  // but available here in order to allow test coverage on corner cases.
+  // The `exchange_finished` callback is called with the answer produced after
+  // SDP negotations has completed.
+  // TODO(srte): Handle lossy links.
+  void NegotiateSdp(
+      std::function<void(SessionDescriptionInterface* offer)> munge_offer,
+      std::function<void(SessionDescriptionInterface* offer)> modify_offer,
+      std::function<void(const SessionDescriptionInterface& answer)>
+          exchange_finished);
+  void NegotiateSdp(
+      std::function<void(SessionDescriptionInterface* offer)> modify_offer,
+      std::function<void(const SessionDescriptionInterface& answer)>
+          exchange_finished);
+  void NegotiateSdp(
+      std::function<void(const SessionDescriptionInterface& answer)>
+          exchange_finished);
+  SignalingRoute reverse() {
+    return SignalingRoute(callee_, caller_, ret_route_, send_route_);
+  }
+
+ private:
+  PeerScenarioClient* const caller_;
+  PeerScenarioClient* const callee_;
+  CrossTrafficRoute* const send_route_;
+  CrossTrafficRoute* const ret_route_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_PEER_SCENARIO_SIGNALING_ROUTE_H_