Add rtpdump and rtc log functionality to screenshare_loopback and video_loopback

webrtc/video/screenshare_loopback.cc

Index: webrtc/video/screenshare_loopback.cc
diff --git a/webrtc/video/screenshare_loopback.cc b/webrtc/video/screenshare_loopback.cc
index 01dee91de597d3dc4d5ee1bbc472f85509a923c3..b037564e19c93c52e52b9072209952e33396de5c 100644
--- a/webrtc/video/screenshare_loopback.cc
+++ b/webrtc/video/screenshare_loopback.cc
@@ -69,6 +69,16 @@ std::string Codec() {
   return static_cast<std::string>(FLAG_codec);
 }
 
+DEFINE_string(rtc_event_log_name, "", "Filename for rtc event log.");
+std::string RtcEventLogName() {
+  return static_cast<std::string>(FLAG_rtc_event_log_name);
+}
+
+DEFINE_string(rtp_dump_name, "", "Filename for dumped received RTP stream.");
+std::string RtpDumpName() {
+  return static_cast<std::string>(FLAG_rtp_dump_name);
+}
+
 DEFINE_int(selected_tl,
            -1,
            "Temporal layer to show or analyze. -1 to disable filtering.");
@@ -275,6 +285,8 @@ void Loopback() {
       flags::OutputFilename(), flags::GraphTitle()};
   params.pipe = pipe_config;
   params.logs = flags::FLAG_logs;
+  params.rtc_event_log_name = flags::RtcEventLogName();
+  params.rtp_dump_name = flags::RtpDumpName();
 
   if (flags::NumStreams() > 1 && flags::Stream0().empty() &&
       flags::Stream1().empty()) {