Implement FrameMarking header extension support

webrtc/test/fuzzers/rtp_packet_fuzzer.cc

Index: webrtc/test/fuzzers/rtp_packet_fuzzer.cc
diff --git a/webrtc/test/fuzzers/rtp_packet_fuzzer.cc b/webrtc/test/fuzzers/rtp_packet_fuzzer.cc
index 3e33699088886b4edd2b95baa88522f7d8769b85..1c88fa465e9e1c2b09810b6bc7ddcf3f6e80a70d 100644
--- a/webrtc/test/fuzzers/rtp_packet_fuzzer.cc
+++ b/webrtc/test/fuzzers/rtp_packet_fuzzer.cc
@@ -109,6 +109,11 @@ void FuzzOneInput(const uint8_t* data, size_t size) {
         packet.GetExtension<RtpMid>(&mid);
         break;
       }
+      case kRtpExtensionFrameMarking: {
+          FrameMarks frame_marks;
+          packet.GetExtension<FrameMarking>(&frame_marks);
+          break;
+      }
     }
   }
 }