[webcrypto] Implement structured clone of keys (blink-side).

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 145 matching lines @@
 }
 
 const WebCryptoRsaHashedKeyGenParams* WebCryptoAlgorithm::rsaHashedKeyGenParams() const
 {
     ASSERT(!isNull());
     if (paramsType() == WebCryptoAlgorithmParamsTypeRsaHashedKeyGenParams)
         return static_cast<WebCryptoRsaHashedKeyGenParams*>(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:
+    case WebCryptoAlgorithmIdRsaSsaPkcs1v1_5:
+    case WebCryptoAlgorithmIdRsaEsPkcs1v1_5:
+    case WebCryptoAlgorithmIdAesGcm:
+    case WebCryptoAlgorithmIdRsaOaep:
+    case WebCryptoAlgorithmIdAesCtr:
+    case WebCryptoAlgorithmIdAesKw:
+        break;
+    }
+    return false;
+}
+
 void WebCryptoAlgorithm::assign(const WebCryptoAlgorithm& other)
 {
     m_private = other.m_private;
 }
 
 void WebCryptoAlgorithm::reset()
 {
     m_private.reset();
 }
 
 } // namespace blink