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diff --git a/third_party/libwebrtc/call/rtp_stream_receiver_controller.h b/third_party/libwebrtc/call/rtp_stream_receiver_controller.h
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+++ b/third_party/libwebrtc/call/rtp_stream_receiver_controller.h
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+/*
+ *  Copyright (c) 2017 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 CALL_RTP_STREAM_RECEIVER_CONTROLLER_H_
+#define CALL_RTP_STREAM_RECEIVER_CONTROLLER_H_
+
+#include <memory>
+
+#include "api/sequence_checker.h"
+#include "call/rtp_demuxer.h"
+#include "call/rtp_stream_receiver_controller_interface.h"
+#include "modules/rtp_rtcp/include/recovered_packet_receiver.h"
+
+namespace webrtc {
+
+class RtpPacketReceived;
+
+// This class represents the RTP receive parsing and demuxing, for a
+// single RTP session.
+// TODO(bugs.webrtc.org/7135): Add RTCP processing, we should aim to terminate
+// RTCP and not leave any RTCP processing to individual receive streams.
+class RtpStreamReceiverController : public RtpStreamReceiverControllerInterface,
+                                    public RecoveredPacketReceiver {
+ public:
+  RtpStreamReceiverController();
+  ~RtpStreamReceiverController() override;
+
+  // Implements RtpStreamReceiverControllerInterface.
+  std::unique_ptr<RtpStreamReceiverInterface> CreateReceiver(
+      uint32_t ssrc,
+      RtpPacketSinkInterface* sink) override;
+
+  // TODO(bugs.webrtc.org/7135): Not yet responsible for parsing.
+  bool OnRtpPacket(const RtpPacketReceived& packet);
+
+  // Implements RecoveredPacketReceiver.
+  // Responsible for demuxing recovered FLEXFEC packets.
+  void OnRecoveredPacket(const RtpPacketReceived& packet) override;
+
+ private:
+  class Receiver : public RtpStreamReceiverInterface {
+   public:
+    Receiver(RtpStreamReceiverController* controller,
+             uint32_t ssrc,
+             RtpPacketSinkInterface* sink);
+
+    ~Receiver() override;
+
+   private:
+    RtpStreamReceiverController* const controller_;
+    RtpPacketSinkInterface* const sink_;
+  };
+
+  // Thread-safe wrappers for the corresponding RtpDemuxer methods.
+  bool AddSink(uint32_t ssrc, RtpPacketSinkInterface* sink);
+  bool RemoveSink(const RtpPacketSinkInterface* sink);
+
+  // TODO(bugs.webrtc.org/11993): We expect construction and all methods to be
+  // called on the same thread/tq. Currently this is the worker thread
+  // (including OnRtpPacket) but a more natural fit would be the network thread.
+  // Using a sequence checker to ensure that usage is correct but at the same
+  // time not require a specific thread/tq, an instance of this class + the
+  // associated functionality should be easily moved from one execution context
+  // to another (i.e. when network packets don't hop to the worker thread inside
+  // of Call).
+  SequenceChecker demuxer_sequence_;
+  // At this level the demuxer is only configured to demux by SSRC, so don't
+  // worry about MIDs (MIDs are handled by upper layers).
+  RtpDemuxer demuxer_ RTC_GUARDED_BY(&demuxer_sequence_){false /*use_mid*/};
+};
+
+}  // namespace webrtc
+
+#endif  // CALL_RTP_STREAM_RECEIVER_CONTROLLER_H_