Create a Perspective enum to use instead of a bool is_server to improve

net/quic/crypto/crypto_utils.cc

 // 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.
 
 #include "net/quic/crypto/crypto_utils.h"
 
 #include "crypto/hkdf.h"
 #include "net/base/net_util.h"
 #include "net/quic/crypto/crypto_handshake.h"
 #include "net/quic/crypto/crypto_protocol.h"
@@ skipping 86 matching lines @@
 
   StringPiece nonce = client_nonce;
   string nonce_storage;
   if (!server_nonce.empty()) {
     nonce_storage = client_nonce.as_string() + server_nonce.as_string();
     nonce = nonce_storage;
   }
 
   crypto::HKDF hkdf(premaster_secret, nonce, hkdf_input, key_bytes,
                     nonce_prefix_bytes, subkey_secret_bytes);
-  if (perspective == SERVER) {
+  if (perspective == Perspective::IS_SERVER) {
     if (!crypters->encrypter->SetKey(hkdf.server_write_key()) ||
         !crypters->encrypter->SetNoncePrefix(hkdf.server_write_iv()) ||
         !crypters->decrypter->SetKey(hkdf.client_write_key()) ||
         !crypters->decrypter->SetNoncePrefix(hkdf.client_write_iv())) {
       return false;
     }
   } else {
     if (!crypters->encrypter->SetKey(hkdf.client_write_key()) ||
         !crypters->encrypter->SetNoncePrefix(hkdf.client_write_iv()) ||
         !crypters->decrypter->SetKey(hkdf.server_write_key()) ||
@@ skipping 35 matching lines @@
                     StringPiece() /* no salt */,
                     info,
                     result_len,
                     0 /* no fixed IV */,
                     0 /* no subkey secret */);
   hkdf.client_write_key().CopyToString(result);
   return true;
 }
 
 }  // namespace net