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diff --git a/third_party/libwebrtc/test/network/traffic_route.h b/third_party/libwebrtc/test/network/traffic_route.h
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+++ b/third_party/libwebrtc/test/network/traffic_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_NETWORK_TRAFFIC_ROUTE_H_
+#define TEST_NETWORK_TRAFFIC_ROUTE_H_
+
+#include <memory>
+#include <vector>
+
+#include "api/test/network_emulation_manager.h"
+#include "rtc_base/copy_on_write_buffer.h"
+#include "system_wrappers/include/clock.h"
+#include "test/network/network_emulation.h"
+
+namespace webrtc {
+namespace test {
+
+// Represents the endpoint for cross traffic that is going through the network.
+// It can be used to emulate unexpected network load.
+class CrossTrafficRouteImpl final : public CrossTrafficRoute {
+ public:
+  CrossTrafficRouteImpl(Clock* clock,
+                        EmulatedNetworkReceiverInterface* receiver,
+                        EmulatedEndpointImpl* endpoint);
+  ~CrossTrafficRouteImpl();
+
+  // Triggers sending of dummy packets with size `packet_size` bytes.
+  void TriggerPacketBurst(size_t num_packets, size_t packet_size) override;
+  // Sends a packet over the nodes and runs `action` when it has been delivered.
+  void NetworkDelayedAction(size_t packet_size,
+                            std::function<void()> action) override;
+
+  void SendPacket(size_t packet_size) override;
+
+ private:
+  void SendPacket(size_t packet_size, uint16_t dest_port);
+
+  Clock* const clock_;
+  EmulatedNetworkReceiverInterface* const receiver_;
+  EmulatedEndpointImpl* const endpoint_;
+
+  uint16_t null_receiver_port_;
+  std::unique_ptr<EmulatedNetworkReceiverInterface> null_receiver_;
+  std::vector<std::unique_ptr<EmulatedNetworkReceiverInterface>> actions_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_NETWORK_TRAFFIC_ROUTE_H_