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

third_party/WebKit/Source/modules/fetch/BodyStreamBuffer.h

 // Copyright 2014 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 BodyStreamBuffer_h
 #define BodyStreamBuffer_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "core/dom/DOMException.h"
@@ skipping 15 matching lines @@
 class ScriptState;
 
 class MODULES_EXPORT BodyStreamBuffer final : public UnderlyingSourceBase, public UnderlyingSource, public WebDataConsumerHandle::Client {
     WTF_MAKE_NONCOPYABLE(BodyStreamBuffer);
     USING_GARBAGE_COLLECTED_MIXIN(BodyStreamBuffer);
 public:
     // Needed because we have to release |m_reader| promptly.
     EAGERLY_FINALIZE();
     // |handle| cannot be null and cannot be locked.
     BodyStreamBuffer(ScriptState*, PassOwnPtr<FetchDataConsumerHandle> /* handle */);
+    // |ReadableStreamOperations::isReadableStream(stream)| must hold.
+    BodyStreamBuffer(ScriptState*, ScriptValue stream);
 
     ScriptValue stream();
 
     // Callable only when neither locked nor disturbed.
     PassRefPtr<BlobDataHandle> drainAsBlobDataHandle(FetchDataConsumerHandle::Reader::BlobSizePolicy);
     PassRefPtr<EncodedFormData> drainAsFormData();
     void startLoading(FetchDataLoader*, FetchDataLoader::Client* /* client */);
 
     // Callable only when not locked. Returns a non-null handle.
     // There is no means to "return" the handle to the body buffer: Calling
@@ skipping 39 matching lines @@
     void endLoading();
     void stopLoading();
 
     RefPtr<ScriptState> m_scriptState;
     OwnPtr<FetchDataConsumerHandle> m_handle;
     OwnPtr<FetchDataConsumerHandle::Reader> m_reader;
     Member<ReadableByteStream> m_stream;
     // We need this member to keep it alive while loading.
     Member<FetchDataLoader> m_loader;
     bool m_streamNeedsMore = false;
+    bool m_madeFromReadableStream;
 };
 
 } // namespace blink
 
 #endif // BodyStreamBuffer_h