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diff --git a/Source/WebCore/Modules/fetch/FetchResponse.h b/Source/WebCore/Modules/fetch/FetchResponse.h
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+++ b/Source/WebCore/Modules/fetch/FetchResponse.h
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+/*
+ * Copyright (C) 2016 Canon Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted, provided that the following conditions
+ * are required to be met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Canon Inc. nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL CANON INC. AND ITS CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(FETCH_API)
+
+#include "FetchBodyOwner.h"
+#include "ResourceResponse.h"
+#include <runtime/TypedArrays.h>
+
+namespace JSC {
+class ExecState;
+class JSValue;
+};
+
+namespace WebCore {
+
+class FetchRequest;
+class ReadableStreamSource;
+
+class FetchResponse final : public FetchBodyOwner {
+public:
+    using Type = ResourceResponse::Type;
+
+    static Ref<FetchResponse> create(ScriptExecutionContext& context) { return adoptRef(*new FetchResponse(context, std::nullopt, FetchHeaders::create(FetchHeaders::Guard::Response), ResourceResponse())); }
+    static Ref<FetchResponse> error(ScriptExecutionContext&);
+    static ExceptionOr<Ref<FetchResponse>> redirect(ScriptExecutionContext&, const String& url, int status);
+
+    using FetchPromise = DOMPromise<IDLInterface<FetchResponse>>;
+    static void fetch(ScriptExecutionContext&, FetchRequest&, FetchPromise&&);
+
+    void consume(unsigned, Ref<DeferredPromise>&&);
+#if ENABLE(READABLE_STREAM_API)
+    void startConsumingStream(unsigned);
+    void consumeChunk(Ref<JSC::Uint8Array>&&);
+    void finishConsumingStream(Ref<DeferredPromise>&&);
+#endif
+
+    ExceptionOr<void> setStatus(int status, const String& statusText);
+    void initializeWith(JSC::ExecState&, JSC::JSValue);
+
+    Type type() const { return m_response.type(); }
+    const String& url() const;
+    bool redirected() const { return m_response.isRedirected(); }
+    int status() const { return m_response.httpStatusCode(); }
+    bool ok() const { return m_response.isSuccessful(); }
+    const String& statusText() const { return m_response.httpStatusText(); }
+
+    FetchHeaders& headers() { return m_headers; }
+    Ref<FetchResponse> cloneForJS();
+
+#if ENABLE(READABLE_STREAM_API)
+    ReadableStreamSource* createReadableStreamSource();
+    void consumeBodyAsStream();
+    void feedStream();
+    void cancel();
+#endif
+
+    bool isLoading() const { return !!m_bodyLoader; }
+
+private:
+    FetchResponse(ScriptExecutionContext&, std::optional<FetchBody>&&, Ref<FetchHeaders>&&, ResourceResponse&&);
+
+    static void startFetching(ScriptExecutionContext&, const FetchRequest&, FetchPromise&&);
+
+    void stop() final;
+    const char* activeDOMObjectName() const final;
+    bool canSuspendForDocumentSuspension() const final;
+
+#if ENABLE(READABLE_STREAM_API)
+    void closeStream();
+#endif
+
+    class BodyLoader final : public FetchLoaderClient {
+    public:
+        BodyLoader(FetchResponse&, FetchPromise&&);
+        ~BodyLoader();
+
+        bool start(ScriptExecutionContext&, const FetchRequest&);
+        void stop();
+
+#if ENABLE(READABLE_STREAM_API)
+        RefPtr<SharedBuffer> startStreaming();
+#endif
+
+    private:
+        // FetchLoaderClient API
+        void didSucceed() final;
+        void didFail() final;
+        void didReceiveResponse(const ResourceResponse&) final;
+        void didReceiveData(const char*, size_t) final;
+
+        FetchResponse& m_response;
+        std::optional<FetchPromise> m_promise;
+        std::unique_ptr<FetchLoader> m_loader;
+    };
+
+    ResourceResponse m_response;
+    std::optional<BodyLoader> m_bodyLoader;
+    mutable String m_responseURL;
+
+    FetchBodyConsumer m_consumer { FetchBodyConsumer::Type::ArrayBuffer  };
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(FETCH_API)