1 files changed, 34 insertions, 0 deletions
diff --git a/layout/style/StylePreloadKind.h b/layout/style/StylePreloadKind.h
new file mode 100644
index 0000000000..154e9cda63
--- /dev/null
+++ b/layout/style/StylePreloadKind.h
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_css_StylePreloadKind_h
+#define mozilla_css_StylePreloadKind_h
+
+#include <stdint.h>
+
+namespace mozilla::css {
+
+enum class StylePreloadKind : uint8_t {
+  // Not a preload.
+  None,
+  // An speculative load from the parser for a <link rel="stylesheet"> or
+  // @import stylesheet.
+  FromParser,
+  // A preload (speculative or not) for a <link rel="preload" as="style">
+  // element.
+  FromLinkRelPreloadElement,
+  // A preload for a "Link" rel=preload response header.
+  FromLinkRelPreloadHeader,
+};
+
+inline bool IsLinkRelPreload(StylePreloadKind aKind) {
+  return aKind == StylePreloadKind::FromLinkRelPreloadElement ||
+         aKind == StylePreloadKind::FromLinkRelPreloadHeader;
+}
+
+}  // namespace mozilla::css
+
+#endif  // mozilla_css_StylePreloadKind_h