Adds CryptoHandshakeMessage::HasStringPiece method.

net/quic/core/crypto/crypto_handshake_message_test.cc

 // Copyright (c) 2015 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 "net/quic/core/crypto/crypto_handshake.h"
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "net/test/gtest_util.h"
 
@@ skipping 99 matching lines @@
 
   // Test assign
   CryptoHandshakeMessage message4 = message3;
   EXPECT_EQ(str, message4.DebugString());
 
   // Test move-assign
   CryptoHandshakeMessage message5 = std::move(message3);
   EXPECT_EQ(str, message5.DebugString());
 }
 
+TEST(CryptoHandshakeMessageTest, HasStringPiece) {
+  CryptoHandshakeMessage message;
+  EXPECT_FALSE(message.HasStringPiece(kRCID));
+  message.SetStringPiece(kRCID, "foo");
+  EXPECT_TRUE(message.HasStringPiece(kRCID));
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace net