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

net/quic/crypto/crypto_utils.h

Index: net/quic/crypto/crypto_utils.h
diff --git a/net/quic/crypto/crypto_utils.h b/net/quic/crypto/crypto_utils.h
index b4e40e9043c07d981a8824e7efa10eb2833fe24f..f51123bb3e7c3ac688f151d838c271f9f61a5a39 100644
--- a/net/quic/crypto/crypto_utils.h
+++ b/net/quic/crypto/crypto_utils.h
@@ -105,6 +105,10 @@ class NET_EXPORT_PRIVATE CryptoUtils {
   static const char* HandshakeFailureReasonToString(
       HandshakeFailureReason reason);
 
+  // Writes a hash of the serialized |message| into |output|.
+  static void HashHandshakeMessage(const CryptoHandshakeMessage& message,
+                                   std::string* output);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(CryptoUtils);
 };