[webcrypto] Add JWK import/export of RSA private keys (NSS).

content/child/webcrypto/shared_crypto.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_SHARED_CRYPTO_H_
 #define CONTENT_CHILD_WEBCRYPTO_SHARED_CRYPTO_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 142 matching lines @@
 
 // Called on the target Blink thread.
 CONTENT_EXPORT bool DeserializeKeyForClone(
     const blink::WebCryptoKeyAlgorithm& algorithm,
     blink::WebCryptoKeyType type,
     bool extractable,
     blink::WebCryptoKeyUsageMask usage_mask,
     const CryptoData& key_data,
     blink::WebCryptoKey* key);
 
+namespace platform {
+class SymKey;
+class PublicKey;
+class PrivateKey;
+}
+
+Status ToPlatformSymKey(const blink::WebCryptoKey& key, platform::SymKey** out);
+
+Status ToPlatformPublicKey(const blink::WebCryptoKey& key,
+                           platform::PublicKey** out);
+
+Status ToPlatformPrivateKey(const blink::WebCryptoKey& key,
+                            platform::PrivateKey** out);
+
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_SHARED_CRYPTO_H_