[webcrypto] Add crypto.subtle.wrapKey() and crypto.subtle.unwrapKey()

Source/modules/crypto/SubtleCrypto.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 ] interface SubtleCrypto {
     [RaisesException] Promise encrypt(Dictionary algorithm, Key key, ArrayBufferView data);
     [RaisesException] Promise decrypt(Dictionary algorithm, Key key, ArrayBufferView data);
     [RaisesException] Promise sign(Dictionary algorithm, Key key, ArrayBufferView data);
     [RaisesException, ImplementedAs=verifySignature] Promise verify(Dictionary algorithm, Key key, ArrayBufferView signature, ArrayBufferView data);
     [RaisesException] Promise digest(Dictionary algorithm, ArrayBufferView data);
 
     [RaisesException] Promise generateKey(Dictionary algorithm, boolean extractable, DOMString[] keyUsages);
     [RaisesException] Promise importKey(DOMString format, ArrayBufferView keyData, Dictionary? algorithm, boolean extractable, DOMString[] keyUsages);
     [RaisesException] Promise exportKey(DOMString format, Key key);
+
+    [RaisesException] Promise wrapKey(DOMString format, Key key, Key wrappingKey, Dictionary wrapAlgorithm);
+    [RaisesException] Promise unwrapKey(DOMString format, ArrayBufferView wrappedKey, Key unwrappingKey, Dictionary unwrapAlgorithm, Dictionary? unwrappedKeyAlgorithm, boolean extractable, DOMString[] keyUsages);
 };