[WebCrypto] Throw syntaxError if keyUsage is empty in ImportKey

content/child/webcrypto/status.h

Index: content/child/webcrypto/status.h
diff --git a/content/child/webcrypto/status.h b/content/child/webcrypto/status.h
index bac8f24138ecccaeb7af94055bf86e2f889d9334..78f2f644da844082aca5b7f52df70b1ccc43cca8 100644
--- a/content/child/webcrypto/status.h
+++ b/content/child/webcrypto/status.h
@@ -220,6 +220,9 @@ class CONTENT_EXPORT Status {
   // and algorithm.
   static Status ErrorCreateKeyBadUsages();
 
+  // Attempted to import a key with an empty key usage.
+  static Status ErrorImportEmptyKeyUsage();
+
   // An EC key imported using SPKI/PKCS8 format had the wrong curve specified in
   // the key.
   static Status ErrorImportedEcKeyIncorrectCurve();