Add methods for creating V8 extras-based ReadableStreams from C++

third_party/WebKit/Source/core/streams/CountQueuingStrategy.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, binding, v8) {
   'use strict';
 
   const defineProperty = global.Object.defineProperty;
 
   class CountQueuingStrategy {
     constructor(options) {
       defineProperty(this, 'highWaterMark', {
         value: options.highWaterMark,
         enumerable: true,
         configurable: true,
         writable: true
       });
     }
+
     size(chunk) { return 1; }
   }
 
   defineProperty(global, 'CountQueuingStrategy', {
     value: CountQueuingStrategy,
     enumerable: false,
     configurable: true,
     writable: true
   });
+
+  // Export a separate copy that doesn't need options objects and can't be
+  // interfered with.
+  class BuiltInCountQueuingStrategy {
+    constructor(highWaterMark) {
+      defineProperty(this, 'highWaterMark', {value: highWaterMark});
+    }
+
+    size(chunk) { return 1; }
+  }
+
+  binding.createBuiltInCountQueuingStrategy = highWaterMark =>
+      new BuiltInCountQueuingStrategy(highWaterMark);
 });