Add reporting of googContentType via GetStats on send side

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 bab495df80c4b0e52f325c7c426ea694af3657f9..00dd7bf7d12525a0435ce9b40eda8faa57a8558f 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -539,6 +539,10 @@ VideoSendStream::Stats SendStatisticsProxy::GetStats() {
   PurgeOldStats();
   stats_.input_frame_rate =
       round(uma_container_->input_frame_rate_tracker_.ComputeRate());
+  stats_.content_type =
+      content_type_ == VideoEncoderConfig::ContentType::kRealtimeVideo
+          ? VideoContentType::UNSPECIFIED
+          : VideoContentType::SCREENSHARE;
   return stats_;
 }