Only update codec type histogram if lifetime is long enough (10 sec).

webrtc/video/send_statistics_proxy.h

Index: webrtc/video/send_statistics_proxy.h
diff --git a/webrtc/video/send_statistics_proxy.h b/webrtc/video/send_statistics_proxy.h
index fa8b3ec5bb63e5a33df13b22f7a40128d3df04dc..2b3e4b2ec231c894eee974d5e070af962d6b171d 100644
--- a/webrtc/video/send_statistics_proxy.h
+++ b/webrtc/video/send_statistics_proxy.h
@@ -139,6 +139,7 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
   const VideoSendStream::Config config_;
   rtc::CriticalSection crit_;
   VideoEncoderConfig::ContentType content_type_ GUARDED_BY(crit_);
+  const int64_t start_ms_;
   VideoSendStream::Stats stats_ GUARDED_BY(crit_);
   uint32_t last_sent_frame_timestamp_ GUARDED_BY(crit_);
   std::map<uint32_t, StatsUpdateTimes> update_times_ GUARDED_BY(crit_);