dcsctp: Add handover state for zero checksum

This CL can prepare downstream projects for being aware of
this new handover state.

This was extracted from change 299076.

Bug: webrtc:14997
Change-Id: I35bfbe040ffbaa5d7266eb67d58078b66083337a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/302980
Reviewed-by: Sergey Sukhanov <sergeysu@webrtc.org>
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39927}
diff --git a/net/dcsctp/public/dcsctp_handover_state.h b/net/dcsctp/public/dcsctp_handover_state.h
index 253f4da..f277ebc 100644
--- a/net/dcsctp/public/dcsctp_handover_state.h
+++ b/net/dcsctp/public/dcsctp_handover_state.h
@@ -40,6 +40,7 @@
     bool partial_reliability = false;
     bool message_interleaving = false;
     bool reconfig = false;
+    bool zero_checksum = false;
     uint16_t negotiated_maximum_incoming_streams = 0;
     uint16_t negotiated_maximum_outgoing_streams = 0;
   };