Add QuicFramer and friends.

net/quic/crypto/quic_decrypter.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_QUIC_DECRYPTER_H_
+#define NET_QUIC_CRYPTO_QUIC_DECRYPTER_H_
+
+#include "net/quic/crypto/crypto_protocol.h"
+#include "net/quic/quic_protocol.h"
+
+namespace net {
+
+class QuicDecrypter {
+ public:
+  virtual ~QuicDecrypter() {}
+
+  static QuicDecrypter* Create(CryptoTag algorithm);
+
+  // Returns a newly created QuicData object containing the decrypted
+  // |ciphertext| or NULL if there is an error.
+  virtual QuicData* Decrypt(base::StringPiece associated_data,
+                            base::StringPiece ciphertext) = 0;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_QUIC_DECRYPTER_H_