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diff --git a/third_party/libwebrtc/api/transport/enums.h b/third_party/libwebrtc/api/transport/enums.h
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+++ b/third_party/libwebrtc/api/transport/enums.h
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+/*
+ *  Copyright 2018 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 API_TRANSPORT_ENUMS_H_
+#define API_TRANSPORT_ENUMS_H_
+
+namespace webrtc {
+
+// See https://w3c.github.io/webrtc-pc/#rtcicetransportstate
+// Note that kFailed is currently not a terminal state, and a transport might
+// incorrectly be marked as failed while gathering candidates, see
+// bugs.webrtc.org/8833
+enum class IceTransportState {
+  kNew,
+  kChecking,
+  kConnected,
+  kCompleted,
+  kFailed,
+  kDisconnected,
+  kClosed,
+};
+
+enum PortPrunePolicy {
+  NO_PRUNE,                 // Do not prune.
+  PRUNE_BASED_ON_PRIORITY,  // Prune lower-priority ports on the same network.
+  KEEP_FIRST_READY          // Keep the first ready port and prune the rest
+                            // on the same network.
+};
+
+enum class VpnPreference {
+  kDefault,      // No VPN preference.
+  kOnlyUseVpn,   // only use VPN connections.
+  kNeverUseVpn,  // never use VPN connections
+  kPreferVpn,    // use a VPN connection if possible,
+                 // i.e VPN connections sorts first.
+  kAvoidVpn,     // only use VPN if there is no other connections,
+                 // i.e VPN connections sorts last.
+};
+
+}  // namespace webrtc
+
+#endif  // API_TRANSPORT_ENUMS_H_