Use CallStats for RTT in Call, rather than VideoSendStream::GetRtt()

webrtc/video/send_statistics_proxy.cc

Index: webrtc/video/send_statistics_proxy.cc
diff --git a/webrtc/video/send_statistics_proxy.cc b/webrtc/video/send_statistics_proxy.cc
index 8102b9310e371f3a419994a0e5324377c2ff4d39..a3bd1850e607311c9a1779b628075b33518b9ae6 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -89,7 +89,8 @@ SendStatisticsProxy::UmaSamplesContainer::UmaSamplesContainer(
       max_sent_width_per_timestamp_(0),
       max_sent_height_per_timestamp_(0),
       input_frame_rate_tracker_(100u, 10u),
-      sent_frame_rate_tracker_(100u, 10u) {}
+      sent_frame_rate_tracker_(100u, 10u),
+      first_rtcp_stats_time_ms_(-1) {}
 
 SendStatisticsProxy::UmaSamplesContainer::~UmaSamplesContainer() {
   UpdateHistograms();
@@ -166,6 +167,16 @@ void SendStatisticsProxy::UmaSamplesContainer::UpdateHistograms() {
     RTC_HISTOGRAMS_COUNTS_100000(kIndex, uma_prefix_ + "SendSideDelayMaxInMs",
                                  max_delay_ms);
   }
+  int fraction_lost = report_block_stats_.FractionLostInPercent();
+  if (first_rtcp_stats_time_ms_ != -1) {
+    int64_t elapsed_time_ms = Clock::GetRealTimeClock()->TimeInMilliseconds() -
+                              first_rtcp_stats_time_ms_;
+    if (elapsed_time_ms / 1000 >= metrics::kMinRunTimeInSeconds &&
+        fraction_lost != -1) {
+      RTC_HISTOGRAMS_PERCENTAGE(
+          kIndex, uma_prefix_ + "SentPacketsLostInPercent", fraction_lost);
+    }
+  }
 }
 
 void SendStatisticsProxy::SetContentType(
@@ -354,6 +365,9 @@ void SendStatisticsProxy::StatisticsUpdated(const RtcpStatistics& statistics,
     return;
 
   stats->rtcp_stats = statistics;
+  uma_container_->report_block_stats_.Store(statistics, 0, ssrc);
+  if (uma_container_->first_rtcp_stats_time_ms_ == -1)
+    uma_container_->first_rtcp_stats_time_ms_ = clock_->TimeInMilliseconds();
 }
 
 void SendStatisticsProxy::CNameChanged(const char* cname, uint32_t ssrc) {