Add a QUIC connection option to use a more conservative handshake retransmission timer. Protected …

net/quic/core/crypto/crypto_protocol.h

Index: net/quic/core/crypto/crypto_protocol.h
diff --git a/net/quic/core/crypto/crypto_protocol.h b/net/quic/core/crypto/crypto_protocol.h
index 8060526a97cbca2de8e3698c5153d4ae50544ddb..411d0c1080334c56db23509a890db529c3ee2e92 100644
--- a/net/quic/core/crypto/crypto_protocol.h
+++ b/net/quic/core/crypto/crypto_protocol.h
@@ -105,6 +105,8 @@ const QuicTag kCTIM = TAG('C', 'T', 'I', 'M');   // Client timestamp in seconds
                                                  // since UNIX epoch.
 const QuicTag kDHDT = TAG('D', 'H', 'D', 'T');   // Disable HPACK dynamic table.
 const QuicTag kIPFS = TAG('I', 'P', 'F', 'S');   // No Immediate Forward Secrecy
+const QuicTag kCONH = TAG('C', 'O', 'N', 'H');   // Conservative Handshake
+                                                 // Retransmissions.
 
 // 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