[webcrypto] Replace KeyAlgorithm interfaces with an Object.

Source/platform/exported/WebCryptoKeyAlgorithm.cpp

 /*
  * Copyright (C) 2014 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 113 matching lines @@
 }
 
 WebCryptoRsaHashedKeyAlgorithmParams* WebCryptoKeyAlgorithm::rsaHashedParams() const
 {
     ASSERT(!isNull());
     if (paramsType() == WebCryptoKeyAlgorithmParamsTypeRsaHashed)
         return static_cast<WebCryptoRsaHashedKeyAlgorithmParams*>(m_private->params.get());
     return 0;
 }
 
+void WebCryptoKeyAlgorithm::writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
+{
+    ASSERT(!isNull());
+    dict->setString("name", WebCryptoAlgorithm::lookupAlgorithmInfo(id())->name);
+    m_private->params.get()->writeToDictionary(dict);
+}
+
 void WebCryptoKeyAlgorithm::assign(const WebCryptoKeyAlgorithm& other)
 {
     m_private = other.m_private;
 }
 
 void WebCryptoKeyAlgorithm::reset()
 {
     m_private.reset();
 }
 
 } // namespace blink