Added cluster id to PacedSender::Callback::TimeToSendPacket.

webrtc/modules/pacing/paced_sender.h

Index: webrtc/modules/pacing/paced_sender.h
diff --git a/webrtc/modules/pacing/paced_sender.h b/webrtc/modules/pacing/paced_sender.h
index 16569b04045fc7febe2cde2f84a68db3c9b06ab2..482b7ad000bd66b84c8bc8e3c22ec36402d51c0e 100644
--- a/webrtc/modules/pacing/paced_sender.h
+++ b/webrtc/modules/pacing/paced_sender.h
@@ -42,7 +42,8 @@ class PacedSender : public Module, public RtpPacketSender {
     virtual bool TimeToSendPacket(uint32_t ssrc,
                                   uint16_t sequence_number,
                                   int64_t capture_time_ms,
-                                  bool retransmission) = 0;
+                                  bool retransmission,
+                                  int cluster_id) = 0;
     // Called when it's a good time to send a padding data.
     // Returns the number of bytes sent.
     virtual size_t TimeToSendPadding(size_t bytes) = 0;