Along with sending the SCUP message, this CL includes small fixes which

net/quic/crypto/crypto_handshake.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_CRYPTO_CRYPTO_HANDSHAKE_H_
 #define NET_QUIC_CRYPTO_CRYPTO_HANDSHAKE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 class CommonCertSets;
 class KeyExchange;
 class QuicDecrypter;
 class QuicEncrypter;
 
@@ skipping 95 matching lines @@
   // sending a client hello.
   std::vector<std::string> cached_certs;
   // client_key_exchange is used by clients to store the ephemeral KeyExchange
   // for the connection.
   scoped_ptr<KeyExchange> client_key_exchange;
   // channel_id is set by servers to a ChannelID key when the client correctly
   // proves possession of the corresponding private key. It consists of 32
   // bytes of x coordinate, followed by 32 bytes of y coordinate. Both values
   // are big-endian and the pair is a P-256 public key.
   std::string channel_id;
+
+  // Used when generating proof signature when sending server config updates.
+  bool x509_ecdsa_supported;
+
+  // Used to generate cert chain when sending server config updates.
+  base::StringPiece client_common_set_hashes;
+  base::StringPiece client_cached_cert_hashes;
 };
 
 // QuicCryptoConfig contains common configuration between clients and servers.
 class NET_EXPORT_PRIVATE QuicCryptoConfig {
  public:
   // kInitialLabel is a constant that is used when deriving the initial
   // (non-forward secure) keys for the connection in order to tie the resulting
   // key to this protocol.
   static const char kInitialLabel[];
 
@@ skipping 17 matching lines @@
 
   const CommonCertSets* common_cert_sets;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicCryptoConfig);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_HANDSHAKE_H_