Adding stats that can be used to compute output audio levels.

webrtc/pc/statscollector.cc

Index: webrtc/pc/statscollector.cc
diff --git a/webrtc/pc/statscollector.cc b/webrtc/pc/statscollector.cc
index c9325831598549b50c3d1e63de24cddd54ab8ab3..ac9210d3f4c88af83acb8edba584fd258937d062 100644
--- a/webrtc/pc/statscollector.cc
+++ b/webrtc/pc/statscollector.cc
@@ -146,6 +146,9 @@ void ExtractStats(const cricket::VoiceReceiverInfo& info, StatsReport* report) {
     { StatsReport::kStatsValueNameAccelerateRate, info.accelerate_rate },
     { StatsReport::kStatsValueNamePreemptiveExpandRate,
       info.preemptive_expand_rate },
+    { StatsReport::kStatsValueNameTotalAudioEnergy, info.total_output_energy },
+    { StatsReport::kStatsValueNameTotalSamplesDuration,
+      info.total_output_duration }
   };
 
   const IntForAdd ints[] = {
@@ -195,6 +198,12 @@ void ExtractStats(const cricket::VoiceSenderInfo& info, StatsReport* report) {
       info.aec_quality_min, info.echo_delay_std_ms,
       info.residual_echo_likelihood, info.residual_echo_likelihood_recent_max);
 
+  const FloatForAdd floats[] = {
+    { StatsReport::kStatsValueNameTotalAudioEnergy, info.total_input_energy },
+    { StatsReport::kStatsValueNameTotalSamplesDuration,
+      info.total_input_duration }
+  };
+
   RTC_DCHECK_GE(info.audio_level, 0);
   const IntForAdd ints[] = {
     { StatsReport::kStatsValueNameAudioInputLevel, info.audio_level},
@@ -203,6 +212,10 @@ void ExtractStats(const cricket::VoiceSenderInfo& info, StatsReport* report) {
     { StatsReport::kStatsValueNamePacketsSent, info.packets_sent },
   };
 
+  for (const auto& f : floats) {
+    report->AddFloat(f.name, f.value);
+  }
+
   for (const auto& i : ints) {
     if (i.value >= 0) {
       report->AddInt(i.name, i.value);