[WebCrypto] Throw syntaxError if keyUsage is empty in ImportKey

content/child/webcrypto/webcrypto_util.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_WEBCRYPTO_UTIL_H_
 #define CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_UTIL_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 61 matching lines @@
 
 // Gets the requested key length in bits for an HMAC import operation.
 Status GetHmacImportKeyLengthBits(
     const blink::WebCryptoHmacImportParams* params,
     unsigned int key_data_byte_length,
     unsigned int* keylen_bits);
 
 Status VerifyAesKeyLengthForImport(unsigned int keylen_bytes);
 
 Status CheckKeyCreationUsages(blink::WebCryptoKeyUsageMask all_possible_usages,
-                              blink::WebCryptoKeyUsageMask actual_usages);
+                              blink::WebCryptoKeyUsageMask actual_usages,
+                              bool allow_empty_usages);
 
 // Extracts the public exponent and modulus length from the Blink parameters.
 // On success it is guaranteed that:
 //   * public_exponent is either 3 or 65537
 //   * modulus_length_bits is a multiple of 8
 //   * modulus_length is >= 256
 //   * modulus_length is <= 16K
 Status GetRsaKeyGenParameters(
     const blink::WebCryptoRsaHashedKeyGenParams* params,
     unsigned int* public_exponent,
@@ skipping 45 matching lines @@
     blink::WebCryptoKeyUsageMask all_public_usages,
     blink::WebCryptoKeyUsageMask all_private_usages,
     blink::WebCryptoKeyUsageMask* public_usages,
     blink::WebCryptoKeyUsageMask* private_usages);
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_UTIL_H_