Add read support of RtpStreamId/RepairedRtpStreamId header extensions.

webrtc/modules/rtp_rtcp/source/rtp_utility.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_utility.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_utility.cc b/webrtc/modules/rtp_rtcp/source/rtp_utility.cc
index 1c12c89c9276222334237f0509ef2953efa92513..d003c0bdb0a511f2190b51e6b1b46e17297c518f 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_utility.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_utility.cc
@@ -469,6 +469,15 @@ void RtpHeaderParser::ParseOneByteExtensionHeader(
           }
           break;
         }
+        case kRtpExtensionRtpStreamId: {
+          header->extension.stream_id.Set(rtc::MakeArrayView(ptr, len + 1));
+          break;
+        }
+        case kRtpExtensionRepairedRtpStreamId: {
+          header->extension.repaired_stream_id.Set(
+              rtc::MakeArrayView(ptr, len + 1));
+          break;
+        }
         case kRtpExtensionNone:
         case kRtpExtensionNumberOfExtensions: {
           RTC_NOTREACHED() << "Invalid extension type: " << type;