Pass time constant to bwe smoothing filter.

webrtc/call/bitrate_allocator.cc

Index: webrtc/call/bitrate_allocator.cc
diff --git a/webrtc/call/bitrate_allocator.cc b/webrtc/call/bitrate_allocator.cc
index 2c5ba6d76cf0e3da055daa629c0357b833bf244a..70763f3e8d059711fb03296889f8baebc3c64e9c 100644
--- a/webrtc/call/bitrate_allocator.cc
+++ b/webrtc/call/bitrate_allocator.cc
@@ -65,13 +65,15 @@ BitrateAllocator::~BitrateAllocator() {
 
 void BitrateAllocator::OnNetworkChanged(uint32_t target_bitrate_bps,
                                         uint8_t fraction_loss,
-                                        int64_t rtt) {
+                                        int64_t rtt,
+                                        int64_t probing_interval_ms) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   last_bitrate_bps_ = target_bitrate_bps;
   last_non_zero_bitrate_bps_ =
       target_bitrate_bps > 0 ? target_bitrate_bps : last_non_zero_bitrate_bps_;
   last_fraction_loss_ = fraction_loss;
   last_rtt_ = rtt;
+  last_probing_interval_ms_ = probing_interval_ms;
 
   // Periodically log the incoming BWE.
   int64_t now = clock_->TimeInMilliseconds();
@@ -85,7 +87,8 @@ void BitrateAllocator::OnNetworkChanged(uint32_t target_bitrate_bps,
   for (auto& config : bitrate_observer_configs_) {
     uint32_t allocated_bitrate = allocation[config.observer];
     uint32_t protection_bitrate = config.observer->OnBitrateUpdated(
-        allocated_bitrate, last_fraction_loss_, last_rtt_);
+        allocated_bitrate, last_fraction_loss_, last_rtt_,
+        last_probing_interval_ms_);
 
     if (allocated_bitrate == 0 && config.allocated_bitrate_bps > 0) {
       if (target_bitrate_bps > 0)
@@ -141,7 +144,8 @@ void BitrateAllocator::AddObserver(BitrateAllocatorObserver* observer,
     for (auto& config : bitrate_observer_configs_) {
       uint32_t allocated_bitrate = allocation[config.observer];
       uint32_t protection_bitrate = config.observer->OnBitrateUpdated(
-          allocated_bitrate, last_fraction_loss_, last_rtt_);
+          allocated_bitrate, last_fraction_loss_, last_rtt_,
+          last_probing_interval_ms_);
       config.allocated_bitrate_bps = allocated_bitrate;
       if (allocated_bitrate > 0)
         config.media_ratio = MediaRatio(allocated_bitrate, protection_bitrate);
@@ -151,7 +155,8 @@ void BitrateAllocator::AddObserver(BitrateAllocatorObserver* observer,
     // But we still have to return the initial config bitrate + let the
     // observer know that it can not produce frames.
     allocation = AllocateBitrates(last_non_zero_bitrate_bps_);
-    observer->OnBitrateUpdated(0, last_fraction_loss_, last_rtt_);
+    observer->OnBitrateUpdated(0, last_fraction_loss_, last_rtt_,
+                               last_probing_interval_ms_);
   }
   UpdateAllocationLimits();
 }