Propagate probing cluster id to SendTimeHistory.

webrtc/modules/pacing/packet_router.cc

Index: webrtc/modules/pacing/packet_router.cc
diff --git a/webrtc/modules/pacing/packet_router.cc b/webrtc/modules/pacing/packet_router.cc
index 1884958aca48f8c6286c13a45d64fe7ec9aca8df..be45615ca5b89c0dc23dad4be9c85775cab8744e 100644
--- a/webrtc/modules/pacing/packet_router.cc
+++ b/webrtc/modules/pacing/packet_router.cc
@@ -50,20 +50,22 @@ bool PacketRouter::TimeToSendPacket(uint32_t ssrc,
   for (auto* rtp_module : rtp_modules_) {
     if (rtp_module->SendingMedia() && ssrc == rtp_module->SSRC()) {
       return rtp_module->TimeToSendPacket(ssrc, sequence_number,
-                                          capture_timestamp, retransmission);
+                                          capture_timestamp, retransmission,
+                                          probe_cluster_id);
     }
   }
   return true;
 }
 
-size_t PacketRouter::TimeToSendPadding(size_t bytes_to_send) {
+size_t PacketRouter::TimeToSendPadding(size_t bytes_to_send,
+                                       int probe_cluster_id) {
   RTC_DCHECK(pacer_thread_checker_.CalledOnValidThread());
   size_t total_bytes_sent = 0;
   rtc::CritScope cs(&modules_crit_);
   for (RtpRtcp* module : rtp_modules_) {
     if (module->SendingMedia()) {
-      size_t bytes_sent =
-          module->TimeToSendPadding(bytes_to_send - total_bytes_sent);
+      size_t bytes_sent = module->TimeToSendPadding(
+          bytes_to_send - total_bytes_sent, probe_cluster_id);
       total_bytes_sent += bytes_sent;
       if (total_bytes_sent >= bytes_to_send)
         break;