Add Generic frame descritpor header extension

to list of extensions supported by RtpPacket.

Bug: webrtc:9361
Change-Id: Iabee824381be3776e17e95f32507058607fc0bc8
Reviewed-on: https://webrtc-review.googlesource.com/85346
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Alex Loiko <aleloi@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23788}

modules/rtp_rtcp/source/rtp_utility.cc

@@ -467,6 +467,10 @@ void RtpHeaderParser::ParseOneByteExtensionHeader(
           header->extension.mid.Set(rtc::MakeArrayView(ptr, len + 1));
           break;
         }
+        case kRtpExtensionGenericFrameDescriptor:
+          RTC_LOG(WARNING)
+              << "RtpGenericFrameDescriptor unsupported by rtp header parser.";
+          break;
         case kRtpExtensionNone:
         case kRtpExtensionNumberOfExtensions: {
           RTC_NOTREACHED() << "Invalid extension type: " << type;