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

Source/modules/crypto/Key.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 55 matching lines @@
 const KeyUsageMapping keyUsageMappings[] = {
     { blink::WebCryptoKeyUsageEncrypt, "encrypt" },
     { blink::WebCryptoKeyUsageDecrypt, "decrypt" },
     { blink::WebCryptoKeyUsageSign, "sign" },
     { blink::WebCryptoKeyUsageVerify, "verify" },
     { blink::WebCryptoKeyUsageDeriveKey, "deriveKey" },
     { blink::WebCryptoKeyUsageWrapKey, "wrapKey" },
     { blink::WebCryptoKeyUsageUnwrapKey, "unwrapKey" },
 };
 
-COMPILE_ASSERT(blink::EndOfWebCryptoKeyUsage == (1 << 6) + 1, update_keyUsageMappings);
+COMPILE_ASSERT(blink::EndOfWebCryptoKeyUsage == (1 << 7) + 1, update_keyUsageMappings);
 
 const char* keyUsageToString(blink::WebCryptoKeyUsage usage)
 {
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(keyUsageMappings); ++i) {
         if (keyUsageMappings[i].value == usage)
             return keyUsageMappings[i].name;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
@@ skipping 130 matching lines @@
     }
     return true;
 }
 
 void Key::trace(Visitor* visitor)
 {
     visitor->trace(m_algorithm);
 }
 
 } // namespace WebCore