Relanding "Pass time constant to bwe smoothing filter."

webrtc/tools/event_log_visualizer/analyzer.cc

Index: webrtc/tools/event_log_visualizer/analyzer.cc
diff --git a/webrtc/tools/event_log_visualizer/analyzer.cc b/webrtc/tools/event_log_visualizer/analyzer.cc
index f98c5443d79b380593098a860d69615856e02f45..f018b1d7a0b69d1385aa9c885dd2dcb156c180e4 100644
--- a/webrtc/tools/event_log_visualizer/analyzer.cc
+++ b/webrtc/tools/event_log_visualizer/analyzer.cc
@@ -449,9 +449,14 @@ class BitrateObserver : public CongestionController::Observer,
  public:
   BitrateObserver() : last_bitrate_bps_(0), bitrate_updated_(false) {}
 
+  // 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 {
     last_bitrate_bps_ = bitrate_bps;
     bitrate_updated_ = true;
   }