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 def431f1709499993bac608a993aa0c49e33bc1b..fe8f5a1d67be3177e4ee391597f3631466467bbb 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_utility.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_utility.cc
@@ -446,6 +446,18 @@ void RtpHeaderParser::ParseOneByteExtensionHeader(
               max_playout_delay * PlayoutDelayLimits::kGranularityMs;
           break;
         }
+        case kRtpExtensionRtpStreamId: {
+          RTC_DCHECK_LE(len + 1, sizeof(header->extension.rid));
+          header->extension.rid_size = len + 1;
+          memcpy(header->extension.rid, ptr, len + 1);
+          break;
+        }
+        case kRtpExtensionRepairRtpStreamId: {
+          RTC_DCHECK_LE(len + 1, sizeof(header->extension.repair_rid));
+          header->extension.repair_rid_size = len + 1;
+          memcpy(header->extension.repair_rid, ptr, len + 1);
+          break;
+        }
         case kRtpExtensionNone:
         case kRtpExtensionNumberOfExtensions: {
           RTC_NOTREACHED() << "Invalid extension type: " << type;