[webcrypto] Implement structured clone of keys (chromium-side).

content/child/webcrypto/shared_crypto.h

Index: content/child/webcrypto/shared_crypto.h
diff --git a/content/child/webcrypto/shared_crypto.h b/content/child/webcrypto/shared_crypto.h
index f668a8a8fcaa724e30c67b40354576da39e266ff..6ff3af94a736334094eeb815065b7873a3049210 100644
--- a/content/child/webcrypto/shared_crypto.h
+++ b/content/child/webcrypto/shared_crypto.h
@@ -151,6 +151,18 @@ CONTENT_EXPORT Status
               blink::WebCryptoKeyUsageMask usage_mask,
               blink::WebCryptoKey* key);
 
+CONTENT_EXPORT Status
+    SerializeKeyForClone(const blink::WebCryptoKey& key,
+                         blink::WebVector<unsigned char>* data);
+
+CONTENT_EXPORT Status
+    DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm,
+                           blink::WebCryptoKeyType type,
+                           bool extractable,
+                           blink::WebCryptoKeyUsageMask usage_mask,
+                           const CryptoData& key_data,
+                           blink::WebCryptoKey* key);
+
 }  // namespace webcrypto
 
 }  // namespace content