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

content/renderer/webcrypto/platform_crypto_openssl.cc

Index: content/renderer/webcrypto/platform_crypto_openssl.cc
diff --git a/content/renderer/webcrypto/platform_crypto_openssl.cc b/content/renderer/webcrypto/platform_crypto_openssl.cc
index 696a37f1d2019f9e3a73b75fb9fe7837c53e0877..48e16127636d584d20ae6bbea0e6add2a5570c65 100644
--- a/content/renderer/webcrypto/platform_crypto_openssl.cc
+++ b/content/renderer/webcrypto/platform_crypto_openssl.cc
@@ -398,6 +398,23 @@ Status ExportKeySpki(PublicKey* key, blink::WebArrayBuffer* buffer) {
   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