Add support for transport wide sequence numbers

webrtc/video/video_send_stream.cc

Index: webrtc/video/video_send_stream.cc
diff --git a/webrtc/video/video_send_stream.cc b/webrtc/video/video_send_stream.cc
index f51e0e251dc1d71be676f4fb93752cd955f061a2..3bf07c9d5e14ec3047b795607517edbf3bba4816 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -17,6 +17,7 @@
 
 #include "webrtc/base/checks.h"
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
+#include "webrtc/modules/pacing/include/packet_router.h"
 #include "webrtc/system_wrappers/interface/logging.h"
 #include "webrtc/system_wrappers/interface/trace_event.h"
 #include "webrtc/video/video_capture_input.h"
@@ -136,6 +137,8 @@ VideoSendStream::VideoSendStream(
       CHECK_EQ(0, vie_channel_->SetSendAbsoluteSendTimeStatus(true, id));
     } else if (extension == RtpExtension::kVideoRotation) {
       CHECK_EQ(0, vie_channel_->SetSendVideoRotationStatus(true, id));
+    } else if (extension == RtpExtension::kTransportSequenceNumber) {
+      CHECK_EQ(0, vie_channel_->SetSendTransportSequenceNumber(true, id));
     } else {
       RTC_NOTREACHED() << "Registering unsupported RTP extension.";
     }