Adds CryptoHandshakeMessage::HasStringPiece method.

net/quic/core/crypto/crypto_handshake_message.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/core/crypto/crypto_handshake_message.h"
 
 #include <memory>
 
+#include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "net/quic/core/crypto/crypto_framer.h"
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "net/quic/core/crypto/crypto_utils.h"
 #include "net/quic/core/quic_socket_address_coder.h"
 #include "net/quic/core/quic_utils.h"
 
 using base::StringPiece;
 using base::StringPrintf;
@@ skipping 84 matching lines @@
 bool CryptoHandshakeMessage::GetStringPiece(QuicTag tag,
                                             StringPiece* out) const {
   QuicTagValueMap::const_iterator it = tag_value_map_.find(tag);
   if (it == tag_value_map_.end()) {
     return false;
   }
   *out = it->second;
   return true;
 }
 
+bool CryptoHandshakeMessage::HasStringPiece(QuicTag tag) const {
+  return base::ContainsKey(tag_value_map_, tag);
+}
+
 QuicErrorCode CryptoHandshakeMessage::GetNthValue24(QuicTag tag,
                                                     unsigned index,
                                                     StringPiece* out) const {
   StringPiece value;
   if (!GetStringPiece(tag, &value)) {
     return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND;
   }
 
   for (unsigned i = 0;; i++) {
     if (value.empty()) {
@@ skipping 191 matching lines @@
       ret += "0x" + QuicUtils::HexEncode(it->second);
     }
     ret += "\n";
   }
   --indent;
   ret += string(2 * indent, ' ') + ">";
   return ret;
 }
 
 }  // namespace net