Use separate rtp module lists for send and receive in PacketRouter.

webrtc/modules/pacing/packet_router.h

Index: webrtc/modules/pacing/packet_router.h
diff --git a/webrtc/modules/pacing/packet_router.h b/webrtc/modules/pacing/packet_router.h
index edef1aa9b3f89618b6c33625487225aebac26c88..60d06aa7744f531618a05f6d734c00cf5f594c7c 100644
--- a/webrtc/modules/pacing/packet_router.h
+++ b/webrtc/modules/pacing/packet_router.h
@@ -36,7 +36,7 @@ class PacketRouter : public PacedSender::Callback,
   PacketRouter();
   virtual ~PacketRouter();
 
-  void AddRtpModule(RtpRtcp* rtp_module);
+  void AddRtpModule(RtpRtcp* rtp_module, bool sender);
   void RemoveRtpModule(RtpRtcp* rtp_module);
 
   // Implements PacedSender::Callback.
@@ -56,7 +56,8 @@ class PacketRouter : public PacedSender::Callback,
  private:
   rtc::CriticalSection modules_lock_;
   // Map from ssrc to sending rtp module.
-  std::list<RtpRtcp*> rtp_modules_ GUARDED_BY(modules_lock_);
+  std::list<RtpRtcp*> send_rtp_modules_ GUARDED_BY(modules_lock_);
+  std::list<RtpRtcp*> recv_rtp_modules_ GUARDED_BY(modules_lock_);
 
   volatile int transport_seq_;