Prevent busy-looping PacedSender on small packets.

webrtc/modules/pacing/paced_sender.cc

Index: webrtc/modules/pacing/paced_sender.cc
diff --git a/webrtc/modules/pacing/paced_sender.cc b/webrtc/modules/pacing/paced_sender.cc
index 23b172c6665d3f9d3dd98c1254e9eda6cdfd76a8..c32d365668d484a0df6445fc7f2e277c576944e0 100644
--- a/webrtc/modules/pacing/paced_sender.cc
+++ b/webrtc/modules/pacing/paced_sender.cc
@@ -323,9 +323,9 @@ void PacedSender::InsertPacket(RtpPacketSender::Priority priority,
 
   if (probing_enabled_ && !prober_->IsProbing())
     prober_->SetEnabled(true);
-  prober_->MaybeInitializeProbe(bitrate_bps_);
-
   int64_t now_ms = clock_->TimeInMilliseconds();
+  prober_->OnIncomingPacket(bitrate_bps_, bytes, now_ms);
+
   if (capture_time_ms < 0)
     capture_time_ms = now_ms;