Add support for transport wide sequence numbers

webrtc/video/audio_receive_stream.cc

Index: webrtc/video/audio_receive_stream.cc
diff --git a/webrtc/video/audio_receive_stream.cc b/webrtc/video/audio_receive_stream.cc
index 9f8bebe462c3921d65e92c4d150f3b1604413ac6..6731ea40ae3e8a9bb8383fe8368d1b59b3f672b6 100644
--- a/webrtc/video/audio_receive_stream.cc
+++ b/webrtc/video/audio_receive_stream.cc
@@ -61,6 +61,9 @@ AudioReceiveStream::AudioReceiveStream(
     } else if (ext.name == RtpExtension::kAbsSendTime) {
       CHECK(rtp_header_parser_->RegisterRtpHeaderExtension(
           kRtpExtensionAbsoluteSendTime, ext.id));
+    } else if (ext.name == RtpExtension::kTransportSequenceNumber) {
+      CHECK(rtp_header_parser_->RegisterRtpHeaderExtension(
+          kRtpExtensionTransportSequenceNumber, ext.id));
     } else {
       RTC_NOTREACHED() << "Unsupported RTP extension.";
     }