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

third_party/WebKit/Source/core/streams/ReadableStreamOperations.h

 // 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.
 
 #ifndef ReadableStreamOperations_h
 #define ReadableStreamOperations_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include <v8.h>
@@ skipping 47 matching lines @@
     // IsReadableStreamErrored
     // This function assumes |isReadableStream(stream)|.
     static bool isErrored(ScriptState*, ScriptValue stream);
 
     // IsReadableStreamDefaultReader
     static bool isReadableStreamDefaultReader(ScriptState*, ScriptValue);
 
     // ReadableStreamDefaultReaderRead
     // This function assumes |isReadableStreamDefaultReader(reader)|.
     static ScriptPromise defaultReaderRead(ScriptState*, ScriptValue reader);
+
+    // ReadableStreamTee
+    // This function assumes |isReadableStream(stream)| and |!isLocked(stream)|
+    static void tee(ScriptState*, ScriptValue stream, ScriptValue* newStream1, ScriptValue* newStream2);
 };
 
 } // namespace blink
 
 #endif // ReadableStreamOperations_h