[webcrypto] Add the KeyAlgorithm interface.

Source/modules/crypto/AesKeyAlgorithm.h

Index: Source/modules/crypto/AesKeyAlgorithm.h
diff --git a/Source/modules/crypto/WorkerCrypto.h b/Source/modules/crypto/AesKeyAlgorithm.h
similarity index 77%
copy from Source/modules/crypto/WorkerCrypto.h
copy to Source/modules/crypto/AesKeyAlgorithm.h
index a3c3564b3524f8e7b04ad7a43154547816fbdaed..d50a34b09d9b0c9ce541448b14a5c5f540bdc477 100644
--- a/Source/modules/crypto/WorkerCrypto.h
+++ b/Source/modules/crypto/AesKeyAlgorithm.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2014 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
@@ -28,30 +28,32 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WorkerCrypto_h
-#define WorkerCrypto_h
+#ifndef AesKeyAlgorithm_h
+#define AesKeyAlgorithm_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "heap/Handle.h"
+#include "modules/crypto/KeyAlgorithm.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class WorkerCrypto : public RefCountedWillBeGarbageCollectedFinalized<WorkerCrypto>, public ScriptWrappable {
+class AesKeyAlgorithm : public KeyAlgorithm {
 public:
-    static PassRefPtrWillBeRawPtr<WorkerCrypto> create()
-    {
-        return adoptRefWillBeNoop(new WorkerCrypto());
-    }
+    static PassRefPtrWillBeRawPtr<AesKeyAlgorithm> create(const blink::WebCryptoKeyAlgorithm&);
 
-    void trace(Visitor*) { }
+    unsigned short length();
+
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
-    WorkerCrypto();
+    explicit AesKeyAlgorithm(const blink::WebCryptoKeyAlgorithm&);
 };
 
-}
+DEFINE_KEY_ALGORITHM_TYPE_CASTS(AesKeyAlgorithm);
+
+} // namespace WebCore
 
 #endif