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

net/quic/quic_crypto_stream.cc

 // Copyright (c) 2012 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.
 
 #include "net/quic/quic_crypto_stream.h"
 
 #include <string>
 
 #include "base/strings/string_piece.h"
 #include "net/quic/crypto/crypto_handshake.h"
@@ skipping 43 matching lines @@
   }
   return data_len;
 }
 
 QuicPriority QuicCryptoStream::EffectivePriority() const {
   return QuicUtils::HighestPriority();
 }
 
 void QuicCryptoStream::SendHandshakeMessage(
     const CryptoHandshakeMessage& message) {
+  SendHandshakeMessage(message, NULL);
+}
+
+void QuicCryptoStream::SendHandshakeMessage(
+    const CryptoHandshakeMessage& message,
+    QuicAckNotifier::DelegateInterface* delegate) {
   DVLOG(1) << ENDPOINT << "Sending " << message.DebugString();
   session()->OnCryptoHandshakeMessageSent(message);
   const QuicData& data = message.GetSerialized();
   // TODO(wtc): check the return value.
-  WriteOrBufferData(string(data.data(), data.length()), false, NULL);
+  WriteOrBufferData(string(data.data(), data.length()), false, delegate);
 }
 
 bool QuicCryptoStream::ExportKeyingMaterial(
     StringPiece label,
     StringPiece context,
     size_t result_len,
     string* result) const {
   if (!handshake_confirmed()) {
     DLOG(ERROR) << "ExportKeyingMaterial was called before forward-secure"
                 << "encryption was established.";
     return false;
   }
   return CryptoUtils::ExportKeyingMaterial(
       crypto_negotiated_params_.subkey_secret,
       label,
       context,
       result_len,
       result);
 }
 
 const QuicCryptoNegotiatedParameters&
 QuicCryptoStream::crypto_negotiated_params() const {
   return crypto_negotiated_params_;
 }
 
 }  // namespace net