WebCrypto: Add ECDSA algorithm (Blink side).

Source/modules/crypto/SubtleCrypto.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 162 matching lines @@
     }
 
     copyStringProperty("use", dict, jsonObject.get());
     copySequenceOfStringProperty("key_ops", dict, jsonObject.get());
     copyStringProperty("alg", dict, jsonObject.get());
 
     bool ext;
     if (DictionaryHelper::get(dict, "ext", ext))
         jsonObject->setBoolean("ext", ext);
 
-    const char* const propertyNames[] = { "d", "n", "e", "p", "q", "dp", "dq", "qi", "k" };
+    const char* const propertyNames[] = { "d", "n", "e", "p", "q", "dp", "dq", "qi", "k", "crv", "x", "y" };
     for (unsigned i = 0; i < WTF_ARRAY_LENGTH(propertyNames); ++i)
         copyStringProperty(propertyNames[i], dict, jsonObject.get());
 
     String json = jsonObject->toJSONString();
     jsonUtf8 = json.utf8();
     return true;
 }
 
 SubtleCrypto::SubtleCrypto()
 {
@@ skipping 197 matching lines @@
         return promise;
 
     if (!unwrappingKey->canBeUsedForAlgorithm(unwrapAlgorithm, WebCryptoOperationUnwrapKey, result.get()))
         return promise;
 
     Platform::current()->crypto()->unwrapKey(format, wrappedKey.bytes(), wrappedKey.byteLength(), unwrappingKey->key(), unwrapAlgorithm, unwrappedKeyAlgorithm, extractable, keyUsages, result->result());
     return promise;
 }
 
 } // namespace blink