Add EVMB to Envoy QUIC connection options.
This will allow us to distinguish Envoy Mobile clients from Cronet in the query logs.
PiperOrigin-RevId: 658454097
diff --git a/quiche/quic/core/crypto/crypto_protocol.h b/quiche/quic/core/crypto/crypto_protocol.h
index c4971de..6f16950 100644
--- a/quiche/quic/core/crypto/crypto_protocol.h
+++ b/quiche/quic/core/crypto/crypto_protocol.h
@@ -284,6 +284,7 @@
// preferred address once it is
// received. Send all coalesced
// packets to both addresses.
+const QuicTag kEVMB = TAG('E', 'V', 'M', 'B');
// Optional support of truncated Connection IDs. If sent by a peer, the value
// is the minimum number of bytes allowed for the connection ID sent to the
