WebCrypto: Add parsing for the algorithm parameter AesDerivedKey.

Source/platform/exported/WebCryptoAlgorithm.cpp

 /*
  * 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 411 matching lines @@
 }
 
 const WebCryptoEcdhKeyDeriveParams* WebCryptoAlgorithm::ecdhKeyDeriveParams() const
 {
     ASSERT(!isNull());
     if (paramsType() == WebCryptoAlgorithmParamsTypeEcdhKeyDeriveParams)
         return static_cast<WebCryptoEcdhKeyDeriveParams*>(m_private->params.get());
     return 0;
 }
 
+const WebCryptoAesDerivedKeyParams* WebCryptoAlgorithm::aesDerivedKeyParams() const
+{
+    ASSERT(!isNull());
+    if (paramsType() == WebCryptoAlgorithmParamsTypeAesDerivedKeyParams)
+        return static_cast<WebCryptoAesDerivedKeyParams*>(m_private->params.get());
+    return 0;
+}
+
 bool WebCryptoAlgorithm::isHash(WebCryptoAlgorithmId id)
 {
     switch (id) {
     case WebCryptoAlgorithmIdSha1:
     case WebCryptoAlgorithmIdSha256:
     case WebCryptoAlgorithmIdSha384:
     case WebCryptoAlgorithmIdSha512:
         return true;
     case WebCryptoAlgorithmIdAesCbc:
     case WebCryptoAlgorithmIdHmac:
@@ skipping 14 matching lines @@
 {
     m_private = other.m_private;
 }
 
 void WebCryptoAlgorithm::reset()
 {
     m_private.reset();
 }
 
 } // namespace blink