WebCrypto: Add WebKit API structure for keys.

Source/modules/crypto/Algorithm.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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/crypto/Algorithm.h"
 
+#include "modules/crypto/AesCbcParams.h"
+#include "modules/crypto/AesKeyGenParams.h"
+
 namespace WebCore {
 
+PassRefPtr<Algorithm> Algorithm::create(const WebKit::WebCryptoAlgorithm& algorithm)
+{
+    switch (algorithm.paramsType()) {
+    case WebKit::WebCryptoAlgorithmParamsTypeNone:
+        return adoptRef(new Algorithm(algorithm));
+    case WebKit::WebCryptoAlgorithmParamsTypeAesCbcParams:
+        return AesCbcParams::create(algorithm);
+    case WebKit::WebCryptoAlgorithmParamsTypeAesKeyGenParams:
+        return AesKeyGenParams::create(algorithm);
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
 Algorithm::Algorithm(const WebKit::WebCryptoAlgorithm& algorithm)
     : m_algorithm(algorithm)
 {
     ScriptWrappable::init(this);
 }
 
-const String& Algorithm::name()
+String Algorithm::name()
 {
-    if (m_name.isNull())
-        m_name = m_algorithm.algorithmName();
-    return m_name;
+    return ASCIILiteral(m_algorithm.algorithmName());
 }
 
 } // namespace WebCore