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diff --git a/third_party/libwebrtc/test/network/network_emulation_manager.h b/third_party/libwebrtc/test/network/network_emulation_manager.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_NETWORK_EMULATION_MANAGER_H_
+#define TEST_NETWORK_NETWORK_EMULATION_MANAGER_H_
+
+#include <map>
+#include <memory>
+#include <set>
+#include <utility>
+#include <vector>
+
+#include "api/array_view.h"
+#include "api/test/network_emulation_manager.h"
+#include "api/test/simulated_network.h"
+#include "api/test/time_controller.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/task_queue_for_test.h"
+#include "rtc_base/task_utils/repeating_task.h"
+#include "system_wrappers/include/clock.h"
+#include "test/network/cross_traffic.h"
+#include "test/network/emulated_network_manager.h"
+#include "test/network/emulated_turn_server.h"
+#include "test/network/network_emulation.h"
+
+namespace webrtc {
+namespace test {
+
+class NetworkEmulationManagerImpl : public NetworkEmulationManager {
+ public:
+  NetworkEmulationManagerImpl(
+      TimeMode mode,
+      EmulatedNetworkStatsGatheringMode stats_gathering_mode);
+  ~NetworkEmulationManagerImpl();
+
+  EmulatedNetworkNode* CreateEmulatedNode(BuiltInNetworkBehaviorConfig config,
+                                          uint64_t random_seed = 1) override;
+  EmulatedNetworkNode* CreateEmulatedNode(
+      std::unique_ptr<NetworkBehaviorInterface> network_behavior) override;
+
+  SimulatedNetworkNode::Builder NodeBuilder() override;
+
+  EmulatedEndpointImpl* CreateEndpoint(EmulatedEndpointConfig config) override;
+  void EnableEndpoint(EmulatedEndpoint* endpoint) override;
+  void DisableEndpoint(EmulatedEndpoint* endpoint) override;
+
+  EmulatedRoute* CreateRoute(EmulatedEndpoint* from,
+                             const std::vector<EmulatedNetworkNode*>& via_nodes,
+                             EmulatedEndpoint* to) override;
+
+  EmulatedRoute* CreateRoute(
+      const std::vector<EmulatedNetworkNode*>& via_nodes) override;
+
+  EmulatedRoute* CreateDefaultRoute(
+      EmulatedEndpoint* from,
+      const std::vector<EmulatedNetworkNode*>& via_nodes,
+      EmulatedEndpoint* to) override;
+
+  void ClearRoute(EmulatedRoute* route) override;
+
+  TcpMessageRoute* CreateTcpRoute(EmulatedRoute* send_route,
+                                  EmulatedRoute* ret_route) override;
+
+  CrossTrafficRoute* CreateCrossTrafficRoute(
+      const std::vector<EmulatedNetworkNode*>& via_nodes) override;
+
+  CrossTrafficGenerator* StartCrossTraffic(
+      std::unique_ptr<CrossTrafficGenerator> generator) override;
+  void StopCrossTraffic(CrossTrafficGenerator* generator) override;
+
+  EmulatedNetworkManagerInterface* CreateEmulatedNetworkManagerInterface(
+      const std::vector<EmulatedEndpoint*>& endpoints) override;
+
+  void GetStats(
+      rtc::ArrayView<EmulatedEndpoint* const> endpoints,
+      std::function<void(EmulatedNetworkStats)> stats_callback) override;
+
+  void GetStats(
+      rtc::ArrayView<EmulatedNetworkNode* const> nodes,
+      std::function<void(EmulatedNetworkNodeStats)> stats_callback) override;
+
+  TimeController* time_controller() override { return time_controller_.get(); }
+
+  TimeMode time_mode() const override { return time_mode_; }
+
+  Timestamp Now() const;
+
+  EmulatedTURNServerInterface* CreateTURNServer(
+      EmulatedTURNServerConfig config) override;
+
+ private:
+  using CrossTrafficSource =
+      std::pair<std::unique_ptr<CrossTrafficGenerator>, RepeatingTaskHandle>;
+
+  absl::optional<rtc::IPAddress> GetNextIPv4Address();
+
+  const TimeMode time_mode_;
+  const EmulatedNetworkStatsGatheringMode stats_gathering_mode_;
+  const std::unique_ptr<TimeController> time_controller_;
+  Clock* const clock_;
+  int next_node_id_;
+
+  RepeatingTaskHandle process_task_handle_;
+
+  uint32_t next_ip4_address_;
+  std::set<rtc::IPAddress> used_ip_addresses_;
+
+  // All objects can be added to the manager only when it is idle.
+  std::vector<std::unique_ptr<EmulatedEndpoint>> endpoints_;
+  std::vector<std::unique_ptr<EmulatedNetworkNode>> network_nodes_;
+  std::vector<std::unique_ptr<EmulatedRoute>> routes_;
+  std::vector<std::unique_ptr<CrossTrafficRoute>> traffic_routes_;
+  std::vector<CrossTrafficSource> cross_traffics_;
+  std::list<std::unique_ptr<TcpMessageRouteImpl>> tcp_message_routes_;
+  std::vector<std::unique_ptr<EndpointsContainer>> endpoints_containers_;
+  std::vector<std::unique_ptr<EmulatedNetworkManager>> network_managers_;
+  std::vector<std::unique_ptr<EmulatedTURNServer>> turn_servers_;
+
+  std::map<EmulatedEndpoint*, EmulatedNetworkManager*>
+      endpoint_to_network_manager_;
+
+  // Must be the last field, so it will be deleted first, because tasks
+  // in the TaskQueue can access other fields of the instance of this class.
+  TaskQueueForTest task_queue_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_NETWORK_NETWORK_EMULATION_MANAGER_H_