[Fetch API] |(new Response(stream)).body| should return |stream|

third_party/WebKit/Source/core/streams/ReadableStream.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 readableStreamReader = v8.createPrivateSymbol('[[reader]]');
   const readableStreamStoredError = v8.createPrivateSymbol('[[storedError]]');
   const readableStreamController = v8.createPrivateSymbol('[[controller]]');
@@ skipping 896 matching lines @@
 
   binding.AcquireReadableStreamDefaultReader = AcquireReadableStreamDefaultReader;
   binding.IsReadableStream = IsReadableStream;
   binding.IsReadableStreamDisturbed = IsReadableStreamDisturbed;
   binding.IsReadableStreamLocked = IsReadableStreamLocked;
   binding.IsReadableStreamReadable = IsReadableStreamReadable;
   binding.IsReadableStreamClosed = IsReadableStreamClosed;
   binding.IsReadableStreamErrored = IsReadableStreamErrored;
   binding.IsReadableStreamDefaultReader = IsReadableStreamDefaultReader;
   binding.ReadableStreamDefaultReaderRead = ReadableStreamDefaultReaderRead;
+  binding.ReadableStreamTee = ReadableStreamTee;
 
   binding.ReadableStreamDefaultControllerClose = ReadableStreamDefaultControllerClose;
   binding.ReadableStreamDefaultControllerGetDesiredSize = ReadableStreamDefaultControllerGetDesiredSize;
   binding.ReadableStreamDefaultControllerEnqueue = ReadableStreamDefaultControllerEnqueue;
   binding.ReadableStreamDefaultControllerError = ReadableStreamDefaultControllerError;
 
   binding.createReadableStreamWithExternalController =
       (underlyingSource, strategy) => {
         return new ReadableStream(
             underlyingSource, strategy, createWithExternalControllerSentinel);
       };
 });