Add macros for ability to log samples that are added to histograms (RTC_LOGGED_*).

webrtc/video/call_stats.cc

Index: webrtc/video/call_stats.cc
diff --git a/webrtc/video/call_stats.cc b/webrtc/video/call_stats.cc
index 8874c2b6317b7d22d4bec6e007e57c809a53042a..a1bf221d4e228406cfc9ae54b7666cbc671ff660 100644
--- a/webrtc/video/call_stats.cc
+++ b/webrtc/video/call_stats.cc
@@ -181,7 +181,7 @@ void CallStats::UpdateHistograms() {
       (clock_->TimeInMilliseconds() - time_of_first_rtt_ms_) / 1000;
   if (elapsed_sec >= metrics::kMinRunTimeInSeconds) {
     int64_t avg_rtt_ms = (sum_avg_rtt_ms_ + num_avg_rtt_ / 2) / num_avg_rtt_;
-    RTC_HISTOGRAM_COUNTS_10000(
+    RTC_LOGGED_HISTOGRAM_COUNTS_10000(
         "WebRTC.Video.AverageRoundTripTimeInMilliseconds", avg_rtt_ms);
   }
 }