[ServiceWorker] Use BodyStreamBuffer as the body data of the Response object.

Source/modules/serviceworkers/Response.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 Response_h
 #define Response_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "modules/serviceworkers/Body.h"
 #include "modules/serviceworkers/FetchResponseData.h"
 #include "modules/serviceworkers/Headers.h"
 #include "platform/blob/BlobData.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Blob;
+class BodyStreamBuffer;
 class DOMArrayBuffer;
 class DOMArrayBufferView;
 class ExceptionState;
 class ResponseInit;
 class WebServiceWorkerResponse;
 
 typedef BlobOrArrayBufferOrArrayBufferViewOrUSVString BodyInit;
 
 class Response final : public Body {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    virtual ~Response() { }
+    ~Response() override { }
 
     // From Response.idl:
     static Response* create(ExecutionContext*, ExceptionState&);
     static Response* create(ExecutionContext*, const BodyInit&, const Dictionary&, ExceptionState&);
 
     static Response* create(ExecutionContext*, Blob*, const ResponseInit&, ExceptionState&);
     static Response* create(ExecutionContext*, FetchResponseData*);
     static Response* create(ExecutionContext*, const WebServiceWorkerResponse&);
-    // The 'FetchResponseData' object is shared between responses, as it is
-    // immutable to the user after Response creation. Headers are copied.
-    static Response* create(const Response&);
+
+    static Response* createClone(const Response&);
 
     const FetchResponseData* response() const { return m_response; }
 
     // From Response.idl:
     String type() const;
     String url() const;
     unsigned short status() const;
     String statusText() const;
     Headers* headers() const;
 
     // From Response.idl:
     Response* clone(ExceptionState&) const;
 
     void populateWebServiceWorkerResponse(WebServiceWorkerResponse&);
 
-    bool hasBody() const { return m_response->blobDataHandle(); }
+    bool hasBody() const;
 
-    virtual void trace(Visitor*) override;
+    PassRefPtr<BlobDataHandle> blobDataHandle() const override;
+    BodyStreamBuffer* buffer() const override;
+    String contentTypeForBuffer() const override;
+
+    PassRefPtr<BlobDataHandle> internalBlobDataHandle() const;
+    BodyStreamBuffer* internalBuffer() const;
+    String internalContentTypeForBuffer() const;
+
+    void trace(Visitor*) override;
 
 private:
     explicit Response(const Response&);
     explicit Response(ExecutionContext*);
     Response(ExecutionContext*, FetchResponseData*);
 
-    virtual PassRefPtr<BlobDataHandle> blobDataHandle() override;
-
     const Member<FetchResponseData> m_response;
     const Member<Headers> m_headers;
 };
 
 } // namespace blink
 
 #endif // Response_h