[webcrypto] Add parameters for AES-GCM and RSA-OAEP to blink API.

Source/core/platform/chromium/support/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 95 matching lines @@
     return 0;
 }
 
 const WebCryptoRsaKeyGenParams* WebCryptoAlgorithm::rsaKeyGenParams() const
 {
     if (paramsType() == WebCryptoAlgorithmParamsTypeRsaKeyGenParams)
         return static_cast<WebCryptoRsaKeyGenParams*>(m_private->params.get());
     return 0;
 }
 
+const WebCryptoAesGcmParams* WebCryptoAlgorithm::aesGcmParams() const
+{
+    if (paramsType() == WebCryptoAlgorithmParamsTypeAesGcmParams)
+        return static_cast<WebCryptoAesGcmParams*>(m_private->params.get());
+    return 0;
+}
+
+const WebCryptoRsaOaepParams* WebCryptoAlgorithm::rsaOaepParams() const
+{
+    if (paramsType() == WebCryptoAlgorithmParamsTypeRsaOaepParams)
+        return static_cast<WebCryptoRsaOaepParams*>(m_private->params.get());
+    return 0;
+}
+
 void WebCryptoAlgorithm::assign(const WebCryptoAlgorithm& other)
 {
     m_private = other.m_private;
 }
 
 void WebCryptoAlgorithm::reset()
 {
     m_private.reset();
 }
 
 } // namespace WebKit