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 db41e1a9baf08cabaf859d7b837c3c45736b9e9d..0a80ed16fc61c6e6c155deb656933dc568f4eaf7 100644
--- a/webrtc/test/fuzzers/rtp_packet_fuzzer.cc
+++ b/webrtc/test/fuzzers/rtp_packet_fuzzer.cc
@@ -104,6 +104,11 @@ void FuzzOneInput(const uint8_t* data, size_t size) {
         packet.GetExtension<RepairedRtpStreamId>(&rsid);
         break;
       }
+      case kRtpExtensionFrameMarking: {
+        FrameMarks frame_marks;
+        packet.GetExtension<FrameMarking>(&frame_marks);
+        break;
+      }
     }
   }
 }