1 files changed, 19 insertions, 0 deletions
diff --git a/dom/streams/StreamUtils.h b/dom/streams/StreamUtils.h
new file mode 100644
index 0000000000..ddfff89c1c
--- /dev/null
+++ b/dom/streams/StreamUtils.h
@@ -0,0 +1,19 @@
+/* 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_dom_StreamUtils_h
+#define mozilla_dom_StreamUtils_h
+
+#include "mozilla/ErrorResult.h"
+
+namespace mozilla::dom {
+
+struct QueuingStrategy;
+
+double ExtractHighWaterMark(const QueuingStrategy& aStrategy,
+                            double aDefaultHWM, ErrorResult& aRv);
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_StreamUtils_h