Pass chrome version and channel in CHLO message to server.

net/quic/crypto/crypto_protocol.h

 // 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.
 
 #ifndef NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 #define NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 
 #include <string>
 
 #include "net/base/net_export.h"
@@ skipping 75 matching lines @@
 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S');  // Public key values
 const QuicTag kSCID = TAG('S', 'C', 'I', 'D');  // Server config id
 const QuicTag kORBT = TAG('O', 'B', 'I', 'T');  // Server orbit.
 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D');  // Proof demand.
 const QuicTag kPROF = TAG('P', 'R', 'O', 'F');  // Proof (signature).
 const QuicTag kCCS  = TAG('C', 'C', 'S', 0);    // Common certificate set
 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T');  // Cached certificate
 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y');  // Expiry
 const QuicTag kIFCW = TAG('I', 'F', 'C', 'W');  // Initial flow control receive
                                                 // window.
+const QuicTag kUAID = TAG('U', 'A', 'I', 'D');  // Client's User Agent ID.
+
 
 // Server hello tags
 const QuicTag kCADR = TAG('C', 'A', 'D', 'R');  // Client IP address and port
 
 // CETV tags
 const QuicTag kCIDK = TAG('C', 'I', 'D', 'K');  // ChannelID key
 const QuicTag kCIDS = TAG('C', 'I', 'D', 'S');  // ChannelID signature
 
 // Public reset tags
 const QuicTag kRNON = TAG('R', 'N', 'O', 'N');  // Public reset nonce proof
@@ skipping 41 matching lines @@
 // amplification factor of any mirror DoS attack.
 //
 // A client may pad an inchoate client hello to a size larger than
 // kClientHelloMinimumSize to make it more likely to receive a complete
 // rejection message.
 const size_t kClientHelloMinimumSize = 1024;
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_