[WebCrypto] Throw syntaxError if keyUsage is empty in ImportKey

content/child/webcrypto/nss/hmac_nss.cc

Index: content/child/webcrypto/nss/hmac_nss.cc
diff --git a/content/child/webcrypto/nss/hmac_nss.cc b/content/child/webcrypto/nss/hmac_nss.cc
index bb146d4977708f8572ecee0207d3643629bb3749..f72b3d9d2bb416693210655cef3078690513f15c 100644
--- a/content/child/webcrypto/nss/hmac_nss.cc
+++ b/content/child/webcrypto/nss/hmac_nss.cc
@@ -98,6 +98,9 @@ class HmacImplementation : public AlgorithmImplementation {
                       bool extractable,
                       blink::WebCryptoKeyUsageMask usages,
                       blink::WebCryptoKey* key) const override {
+    if (usages == 0)
+      return Status::ErrorImportKeyEmptyUsages();
+
     const blink::WebCryptoAlgorithm& hash =
         algorithm.hmacImportParams()->hash();
 
@@ -122,6 +125,9 @@ class HmacImplementation : public AlgorithmImplementation {
                       bool extractable,
                       blink::WebCryptoKeyUsageMask usages,
                       blink::WebCryptoKey* key) const override {
+    if (usages == 0)
+      return Status::ErrorImportKeyEmptyUsages();
+
     const char* algorithm_name =
         GetJwkHmacAlgorithmName(algorithm.hmacImportParams()->hash().id());
     if (!algorithm_name)