Add logging of delay-based bandwidth estimate.

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index a9cf2b26dc8edea51bb8d56b57d13a52275e58b2..da046b28ce108890afc5f822e7ed626e57d0983f 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -140,6 +140,14 @@ class RtcEventLogProxy final : public webrtc::RtcEventLog {
     }
   }
 
+  void LogBwePacketDelayEvent(int32_t bitrate,
+                              BandwidthUsage detector_state) override {
+    rtc::CritScope lock(&crit_);
+    if (event_log_) {
+      event_log_->LogBwePacketDelayEvent(bitrate, detector_state);
+    }
+  }
+
   void LogAudioNetworkAdaptation(
       const AudioNetworkAdaptor::EncoderRuntimeConfig& config) override {
     rtc::CritScope lock(&crit_);