Add logging of delay-based bandwidth estimate.

webrtc/logging/rtc_event_log/rtc_event_log.cc

Index: webrtc/logging/rtc_event_log/rtc_event_log.cc
diff --git a/webrtc/logging/rtc_event_log/rtc_event_log.cc b/webrtc/logging/rtc_event_log/rtc_event_log.cc
index b545d6453d7197f34341a61b1c5ca3a6a1dd8600..96f1ea1d807ded71ffb29a6f305bb6d9ee215202 100644
--- a/webrtc/logging/rtc_event_log/rtc_event_log.cc
+++ b/webrtc/logging/rtc_event_log/rtc_event_log.cc
@@ -77,6 +77,8 @@ class RtcEventLogImpl final : public RtcEventLog {
   void LogBwePacketLossEvent(int32_t bitrate,
                              uint8_t fraction_loss,
                              int32_t total_packets) override;
+  void LogBwePacketDelayEvent(int32_t bitrate,
+                              BandwidthUsage detector_state) override;
   void LogAudioNetworkAdaptation(
       const AudioNetworkAdaptor::EncoderRuntimeConfig& config) override;
 
@@ -129,6 +131,20 @@ rtclog::MediaType ConvertMediaType(MediaType media_type) {
   return rtclog::ANY;
 }
 
+rtclog::BwePacketDelayEvent::DetectorState ConvertDetectorState(
+    BandwidthUsage state) {
+  switch (state) {
+    case BandwidthUsage::kBwNormal:
+      return rtclog::BwePacketDelayEvent::BWE_NORMAL;
+    case BandwidthUsage::kBwUnderusing:
+      return rtclog::BwePacketDelayEvent::BWE_UNDERUSING;
+    case BandwidthUsage::kBwOverusing:
+      return rtclog::BwePacketDelayEvent::BWE_OVERUSING;
+  }
+  RTC_NOTREACHED();
+  return rtclog::BwePacketDelayEvent::BWE_NORMAL;
+}
+
 // The RTP and RTCP buffers reserve space for twice the expected number of
 // sent packets because they also contain received packets.
 static const int kEventsPerSecond = 1000;
@@ -436,6 +452,17 @@ void RtcEventLogImpl::LogBwePacketLossEvent(int32_t bitrate,
   StoreEvent(&event);
 }
 
+void RtcEventLogImpl::LogBwePacketDelayEvent(int32_t bitrate,
+                                             BandwidthUsage detector_state) {
+  std::unique_ptr<rtclog::Event> event(new rtclog::Event());
+  event->set_timestamp_us(rtc::TimeMicros());
+  event->set_type(rtclog::Event::BWE_PACKET_DELAY_EVENT);
+  auto bwe_event = event->mutable_bwe_packet_delay_event();
+  bwe_event->set_bitrate(bitrate);
+  bwe_event->set_detector_state(ConvertDetectorState(detector_state));
+  StoreEvent(&event);
+}
+
 void RtcEventLogImpl::LogAudioNetworkAdaptation(
     const AudioNetworkAdaptor::EncoderRuntimeConfig& config) {
   std::unique_ptr<rtclog::Event> event(new rtclog::Event());