Propagate probing cluster id to SendTimeHistory.

webrtc/modules/congestion_controller/congestion_controller.cc

Index: webrtc/modules/congestion_controller/congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/congestion_controller.cc b/webrtc/modules/congestion_controller/congestion_controller.cc
index 5767448a5f7bf711a24ef214ea47d5f5cac18f20..e0eaa720c75d424f03c39fff5ae0d933ca45d990 100644
--- a/webrtc/modules/congestion_controller/congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller.cc
@@ -48,10 +48,11 @@ class WrappingBitrateEstimator : public RemoteBitrateEstimator {
   void IncomingPacket(int64_t arrival_time_ms,
                       size_t payload_size,
                       const RTPHeader& header,
-                      bool was_paced) override {
+                      int probe_cluster_id) override {
     CriticalSectionScoped cs(crit_sect_.get());
     PickEstimatorFromHeader(header);
-    rbe_->IncomingPacket(arrival_time_ms, payload_size, header, was_paced);
+    rbe_->IncomingPacket(arrival_time_ms, payload_size, header,
+                         probe_cluster_id);

[stefan-webrtc, 2016/05/26 16:29:49]

Note that this code is running on the receive-side, so you won't know the
cluster id here.

   }
 
   void Process() override {