stream: rewrite WHATWG Stream in C++

lib/internal/webstreams/queuingstrategies.js

@@ -154,4 +154,9 @@ ObjectDefineProperties(CountQueuingStrategy.prototype, {
 module.exports = {
   ByteLengthQueuingStrategy,
   CountQueuingStrategy,
+
+  // Exported so the C++ stream binding can recognize the built-in queuing
+  // strategies by identity and skip the per-chunk JS size() boundary cross.
+  byteSizeFunction,
+  countSizeFunction,
 };