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

content/child/webcrypto/webcrypto_impl.h

Index: content/child/webcrypto/webcrypto_impl.h
diff --git a/content/child/webcrypto/webcrypto_impl.h b/content/child/webcrypto/webcrypto_impl.h
index 001471582cfef576141c31171bb854a66bb5d936..2112bfea4aed171fdcda8299d898593d42bf24e6 100644
--- a/content/child/webcrypto/webcrypto_impl.h
+++ b/content/child/webcrypto/webcrypto_impl.h
@@ -68,6 +68,18 @@ class WebCryptoImpl : public blink::WebCrypto {
                                  unsigned int data_size,
                                  blink::WebArrayBuffer& result);
 
+  virtual bool deserializeKeyForClone(
+      const blink::WebCryptoKeyAlgorithm& algorithm,
+      blink::WebCryptoKeyType type,
+      bool extractable,
+      blink::WebCryptoKeyUsageMask usages,
+      const unsigned char* key_data,
+      unsigned key_data_size,
+      blink::WebCryptoKey& key);
+
+  virtual bool serializeKeyForClone(const blink::WebCryptoKey& key,
+                                    blink::WebVector<unsigned char>& key_data);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(WebCryptoImpl);
 };