[webcrypto] Add raw symmetric key AES-KW wrap/unwrap for NSS.

content/renderer/webcrypto/platform_crypto_openssl.cc

 // Copyright 2014 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 "content/renderer/webcrypto/platform_crypto.h"
 
 #include <vector>
 #include <openssl/aes.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
@@ skipping 370 matching lines @@
                       blink::WebCryptoKey* key) {
   // TODO(eroman): http://crbug.com/267888
   return Status::ErrorUnsupported();
 }
 
 Status ExportKeySpki(PublicKey* key, blink::WebArrayBuffer* buffer) {
   // TODO(eroman): http://crbug.com/267888
   return Status::ErrorUnsupported();
 }
 
+Status WrapSymKeyAesKw(SymKey* wrapping_key,
+                       SymKey* key,
+                       blink::WebArrayBuffer* buffer) {
+  // TODO(eroman): http://crbug.com/267888
+  return Status::ErrorUnsupported();
+}
+
+Status UnwrapSymKeyAesKw(const CryptoData& wrapped_key_data,
+                         SymKey* wrapping_key,
+                         const blink::WebCryptoAlgorithm& algorithm,
+                         bool extractable,
+                         blink::WebCryptoKeyUsageMask usage_mask,
+                         blink::WebCryptoKey* key) {
+  // TODO(eroman): http://crbug.com/267888
+  return Status::ErrorUnsupported();
+}
+
 }  // namespace platform
 
 }  // namespace webcrypto
 
 }  // namespace content