Piggybacking simulcast id and ALR experiment id into video content type extension.

webrtc/logging/rtc_event_log/rtc_event_log2text.cc

Index: webrtc/logging/rtc_event_log/rtc_event_log2text.cc
diff --git a/webrtc/logging/rtc_event_log/rtc_event_log2text.cc b/webrtc/logging/rtc_event_log/rtc_event_log2text.cc
index c17a3b58028c3048644bdbff4abf0b43be3a7de8..156c1e896bb2198a495a47200b93c474555d2e76 100644
--- a/webrtc/logging/rtc_event_log/rtc_event_log2text.cc
+++ b/webrtc/logging/rtc_event_log/rtc_event_log2text.cc
@@ -464,7 +464,8 @@ int main(int argc, char* argv[]) {
       }
       if (parsed_header.extension.hasVideoContentType) {
         std::cout << "\tContentType="
-                  << static_cast<int>(parsed_header.extension.videoContentType);
+                  << static_cast<uint8_t>(
+                         parsed_header.extension.videoContentType);
       }
       if (parsed_header.extension.hasVideoRotation) {
         std::cout << "\tRotation="