Add logging of delay-based bandwidth estimate.

webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h

Index: webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
diff --git a/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h b/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
index 4db33a13ec6b6bb5c3bf215702b88e79095663ae..a47aa65cc8986fa8968787e319b68ecae02c2da9 100644
--- a/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
+++ b/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
@@ -58,6 +58,10 @@ class MockRtcEventLog : public RtcEventLog {
                void(int32_t bitrate,
                     uint8_t fraction_loss,
                     int32_t total_packets));
+
+  MOCK_METHOD2(LogBwePacketDelayEvent,
+               void(int32_t bitrate, BandwidthUsage detector_state));
+
   MOCK_METHOD1(LogAudioNetworkAdaptation,
                void(const AudioNetworkAdaptor::EncoderRuntimeConfig& config));
 };