[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 e0c1e1776f49329d1e0be53228c279960125422c..22646926fc94dc85933682b03a5b6384bbc07434 100644
--- a/content/renderer/webcrypto/platform_crypto_openssl.cc
+++ b/content/renderer/webcrypto/platform_crypto_openssl.cc
@@ -388,6 +388,23 @@ 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