Refactor WebCrypto code

content/child/webcrypto/algorithm_registry.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_CHILD_WEBCRYPTO_ALGORITHM_REGISTRY_H_
+#define CONTENT_CHILD_WEBCRYPTO_ALGORITHM_REGISTRY_H_
+
+#include "third_party/WebKit/public/platform/WebCrypto.h"
+
+namespace content {
+
+namespace webcrypto {
+
+class AlgorithmImplementation;
+class Status;
+
+// Retrieves the AlgorithmImplementation applicable for |id|.
+//
+// If there is no available implementation, then an error is returned, and
+// *impl is set to NULL.
+//
+// Otherwise Success is returned and *impl is set to a non-NULL value. The
+// AlgorithmImplementation pointer will remain valid until the program's
+// termination.
+Status GetAlgorithmImplementation(blink::WebCryptoAlgorithmId id,
+                                  const AlgorithmImplementation** impl);
+
+}  // namespace webcrypto
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_WEBCRYPTO_ALGORITHM_REGISTRY_H_