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diff --git a/webrtc/modules/pacing/packet_router.h b/webrtc/modules/pacing/packet_router.h
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+++ b/webrtc/modules/pacing/packet_router.h
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+/*
+ *  Copyright (c) 2015 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 WEBRTC_MODULES_PACING_PACKET_ROUTER_H_
+#define WEBRTC_MODULES_PACING_PACKET_ROUTER_H_
+
+#include <list>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/base/thread_annotations.h"
+#include "webrtc/common_types.h"
+#include "webrtc/modules/pacing/paced_sender.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
+
+namespace webrtc {
+
+class RtpRtcp;
+namespace rtcp {
+class TransportFeedback;
+}  // namespace rtcp
+
+// PacketRouter routes outgoing data to the correct sending RTP module, based
+// on the simulcast layer in RTPVideoHeader.
+class PacketRouter : public PacedSender::Callback,
+                     public TransportSequenceNumberAllocator {
+ public:
+  PacketRouter();
+  virtual ~PacketRouter();
+
+  void AddRtpModule(RtpRtcp* rtp_module);
+  void RemoveRtpModule(RtpRtcp* rtp_module);
+
+  // Implements PacedSender::Callback.
+  bool TimeToSendPacket(uint32_t ssrc,
+                        uint16_t sequence_number,
+                        int64_t capture_timestamp,
+                        bool retransmission) override;
+
+  size_t TimeToSendPadding(size_t bytes) override;
+
+  void SetTransportWideSequenceNumber(uint16_t sequence_number);
+  uint16_t AllocateSequenceNumber() override;
+
+  // Send transport feedback packet to send-side.
+  virtual bool SendFeedback(rtcp::TransportFeedback* packet);
+
+ private:
+  rtc::CriticalSection modules_lock_;
+  // Map from ssrc to sending rtp module.
+  std::list<RtpRtcp*> rtp_modules_ GUARDED_BY(modules_lock_);
+
+  volatile int transport_seq_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(PacketRouter);
+};
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_PACING_PACKET_ROUTER_H_