Add delay metric (includes network delay (rtt/2) + jitter delay + decode time +

webrtc/video/receive_statistics_proxy.cc

Index: webrtc/video/receive_statistics_proxy.cc
diff --git a/webrtc/video/receive_statistics_proxy.cc b/webrtc/video/receive_statistics_proxy.cc
index b6063a80afbb1719b2c013a0881a52910da3a38d..534428b7eeec9b6d8ff49ffe0cb8d94650632394 100644
--- a/webrtc/video/receive_statistics_proxy.cc
+++ b/webrtc/video/receive_statistics_proxy.cc
@@ -53,6 +53,10 @@ void ReceiveStatisticsProxy::UpdateHistograms() {
   int decode_ms = decode_time_counter_.Avg(kMinRequiredDecodeSamples);
   if (decode_ms != -1)
     RTC_HISTOGRAM_COUNTS_1000("WebRTC.Video.DecodeTimeInMs", decode_ms);
+
+  int delay_ms = delay_counter_.Avg(kMinRequiredDecodeSamples);
+  if (delay_ms != -1)
+    RTC_HISTOGRAM_COUNTS_10000("WebRTC.Video.OnewayDelayInMs", delay_ms);
 }
 
 VideoReceiveStream::Stats ReceiveStatisticsProxy::GetStats() const {
@@ -78,7 +82,8 @@ void ReceiveStatisticsProxy::OnDecoderTiming(int decode_ms,
                                              int target_delay_ms,
                                              int jitter_buffer_ms,
                                              int min_playout_delay_ms,
-                                             int render_delay_ms) {
+                                             int render_delay_ms,
+                                             int64_t rtt_ms) {
   rtc::CritScope lock(&crit_);
   stats_.decode_ms = decode_ms;
   stats_.max_decode_ms = max_decode_ms;
@@ -88,6 +93,9 @@ void ReceiveStatisticsProxy::OnDecoderTiming(int decode_ms,
   stats_.min_playout_delay_ms = min_playout_delay_ms;
   stats_.render_delay_ms = render_delay_ms;
   decode_time_counter_.Add(decode_ms);
+  // Network delay (rtt/2) + target_delay_ms (jitter delay + decode time +
+  // render delay).
+  delay_counter_.Add(target_delay_ms + rtt_ms / 2);
 }
 
 void ReceiveStatisticsProxy::RtcpPacketTypesCounterUpdated(