Relanding "Pass time constant to bwe smoothing filter."

webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc

Index: webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc
diff --git a/webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc b/webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc
index 42817fa40ba8385467cbad65ccc27318bf167f64..de78a85afe0331e1e16dec5b96fb1274160c77ef 100644
--- a/webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc
+++ b/webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc
@@ -19,9 +19,15 @@ class NullBitrateObserver : public CongestionController::Observer,
                             public RemoteBitrateObserver {
  public:
   ~NullBitrateObserver() override {}
+
+  // TODO(minyue): remove this when old OnNetworkChanged is deprecated. See
+  // https://bugs.chromium.org/p/webrtc/issues/detail?id=6796
+  using CongestionController::Observer::OnNetworkChanged;
+
   void OnNetworkChanged(uint32_t bitrate_bps,
                         uint8_t fraction_loss,
-                        int64_t rtt_ms) override {}
+                        int64_t rtt_ms,
+                        int64_t probing_interval_ms) override {}
   void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
                                uint32_t bitrate) override {}
 };