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diff --git a/third_party/libwebrtc/net/dcsctp/socket/context.h b/third_party/libwebrtc/net/dcsctp/socket/context.h
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+/*
+ * Copyright (c) 2021 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 NET_DCSCTP_SOCKET_CONTEXT_H_
+#define NET_DCSCTP_SOCKET_CONTEXT_H_
+
+#include <cstdint>
+
+#include "absl/strings/string_view.h"
+#include "net/dcsctp/common/internal_types.h"
+#include "net/dcsctp/packet/sctp_packet.h"
+#include "net/dcsctp/public/dcsctp_socket.h"
+#include "net/dcsctp/public/types.h"
+
+namespace dcsctp {
+
+// A set of helper methods used by handlers to e.g. send packets.
+//
+// Implemented by the TransmissionControlBlock.
+class Context {
+ public:
+ virtual ~Context() = default;
+
+ // Indicates if a connection has been established.
+ virtual bool is_connection_established() const = 0;
+
+ // Returns this side's initial TSN value.
+ virtual TSN my_initial_tsn() const = 0;
+
+ // Returns the peer's initial TSN value.
+ virtual TSN peer_initial_tsn() const = 0;
+
+ // Returns the socket callbacks.
+ virtual DcSctpSocketCallbacks& callbacks() const = 0;
+
+ // Observes a measured RTT value, in milliseconds.
+ virtual void ObserveRTT(DurationMs rtt_ms) = 0;
+
+ // Returns the current Retransmission Timeout (rto) value, in milliseconds.
+ virtual DurationMs current_rto() const = 0;
+
+ // Increments the transmission error counter, given a human readable reason.
+ virtual bool IncrementTxErrorCounter(absl::string_view reason) = 0;
+
+ // Clears the transmission error counter.
+ virtual void ClearTxErrorCounter() = 0;
+
+ // Returns true if there have been too many retransmission errors.
+ virtual bool HasTooManyTxErrors() const = 0;
+
+ // Returns a PacketBuilder, filled in with the correct verification tag.
+ virtual SctpPacket::Builder PacketBuilder() const = 0;
+
+ // Builds the packet from `builder` and sends it.
+ virtual void Send(SctpPacket::Builder& builder) = 0;
+};
+
+} // namespace dcsctp
+
+#endif // NET_DCSCTP_SOCKET_CONTEXT_H_