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

net/quic/quic_crypto_stream.h

Index: net/quic/quic_crypto_stream.h
diff --git a/net/quic/quic_crypto_stream.h b/net/quic/quic_crypto_stream.h
index 131e096f31025860b87e5782ed8de6dfb8b8b3ef..4cce73c2eecfe34567e316cb18921292acecc232 100644
--- a/net/quic/quic_crypto_stream.h
+++ b/net/quic/quic_crypto_stream.h
@@ -45,6 +45,10 @@ class NET_EXPORT_PRIVATE QuicCryptoStream
   // Sends |message| to the peer.
   // TODO(wtc): return a success/failure status.
   void SendHandshakeMessage(const CryptoHandshakeMessage& message);
+  // As above, but registers |delegate| for notification when |message| has been
+  // ACKed by the peer.
+  void SendHandshakeMessage(const CryptoHandshakeMessage& message,
+                            QuicAckNotifier::DelegateInterface* delegate);
 
   // Performs key extraction to derive a new secret of |result_len| bytes
   // dependent on |label|, |context|, and the stream's negotiated subkey secret.