Add histograms for send-side delay stats for a sent video stream:

webrtc/video/send_statistics_proxy.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 103 matching lines @@
   int bw_limited = bw_limited_frame_counter_.Percent(kMinRequiredSamples);
   if (bw_limited != -1) {
     RTC_HISTOGRAM_PERCENTAGE("WebRTC.Video.BandwidthLimitedResolutionInPercent",
         bw_limited);
   }
   int num_disabled = bw_resolutions_disabled_counter_.Avg(kMinRequiredSamples);
   if (num_disabled != -1) {
     RTC_HISTOGRAM_ENUMERATION(
         "WebRTC.Video.BandwidthLimitedResolutionsDisabled", num_disabled, 10);
   }
+  int delay_ms = delay_counter_.Avg(kMinRequiredSamples);
+  if (delay_ms != -1)
+    RTC_HISTOGRAM_COUNTS_100000("WebRTC.Video.SendSideDelayInMs", delay_ms);
+
+  int max_delay_ms = max_delay_counter_.Avg(kMinRequiredSamples);
+  if (max_delay_ms != -1) {
+    RTC_HISTOGRAM_COUNTS_100000(
+        "WebRTC.Video.SendSideDelayMaxInMs", max_delay_ms);
+  }
 }
 
 void SendStatisticsProxy::OnOutgoingRate(uint32_t framerate, uint32_t bitrate) {
   rtc::CritScope lock(&crit_);
   stats_.encode_frame_rate = framerate;
   stats_.media_bitrate_bps = bitrate;
 }
 
 void SendStatisticsProxy::CpuOveruseMetricsUpdated(
     const CpuOveruseMetrics& metrics) {
@@ skipping 196 matching lines @@
 
 void SendStatisticsProxy::SendSideDelayUpdated(int avg_delay_ms,
                                                int max_delay_ms,
                                                uint32_t ssrc) {
   rtc::CritScope lock(&crit_);
   VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
   if (stats == nullptr)
     return;
   stats->avg_delay_ms = avg_delay_ms;
   stats->max_delay_ms = max_delay_ms;
+
+  delay_counter_.Add(avg_delay_ms);
+  max_delay_counter_.Add(max_delay_ms);
 }
 
 void SendStatisticsProxy::SampleCounter::Add(int sample) {
   sum += sample;
   ++num_samples;
 }
 
 int SendStatisticsProxy::SampleCounter::Avg(int min_required_samples) const {
   if (num_samples < min_required_samples || num_samples == 0)
     return -1;
@@ skipping 17 matching lines @@
 }
 
 int SendStatisticsProxy::BoolSampleCounter::Fraction(
     int min_required_samples, float multiplier) const {
   if (num_samples < min_required_samples || num_samples == 0)
     return -1;
   return static_cast<int>((sum * multiplier / num_samples) + 0.5f);
 }
 
 }  // namespace webrtc