Add QUIC 31 in which the server's proof covers both the static server config as well as a hash of t…

net/quic/quic_protocol.cc

Index: net/quic/quic_protocol.cc
diff --git a/net/quic/quic_protocol.cc b/net/quic/quic_protocol.cc
index 7de88d77abfbdbeacfcb7c1229bb71fd920033f2..73338741de0e5daaabd5e8d57182a65f60b17095 100644
--- a/net/quic/quic_protocol.cc
+++ b/net/quic/quic_protocol.cc
@@ -200,6 +200,8 @@ QuicTag QuicVersionToQuicTag(const QuicVersion version) {
       return MakeQuicTag('Q', '0', '2', '9');
     case QUIC_VERSION_30:
       return MakeQuicTag('Q', '0', '3', '0');
+    case QUIC_VERSION_31:
+      return MakeQuicTag('Q', '0', '3', '1');
     default:
       // This shold be an ERROR because we should never attempt to convert an
       // invalid QuicVersion to be written to the wire.
@@ -232,6 +234,7 @@ string QuicVersionToString(const QuicVersion version) {
     RETURN_STRING_LITERAL(QUIC_VERSION_28);
     RETURN_STRING_LITERAL(QUIC_VERSION_29);
     RETURN_STRING_LITERAL(QUIC_VERSION_30);
+    RETURN_STRING_LITERAL(QUIC_VERSION_31);
     default:
       return "QUIC_VERSION_UNSUPPORTED";
   }