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

Source/modules/serviceworkers/Request.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 Request_h
 #define Request_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/FetchRequestData.h"
 #include "modules/serviceworkers/Headers.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/WebURLRequest.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+class BodyStreamBuffer;
 class RequestInit;
 class WebServiceWorkerRequest;
 
 typedef RequestOrUSVString RequestInfo;
 
 class Request final : public Body {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    virtual ~Request() { }
+    ~Request() override { }
 
     // From Request.idl:
     static Request* create(ExecutionContext*, const RequestInfo&, const Dictionary&, ExceptionState&);
 
     static Request* create(ExecutionContext*, const String&, ExceptionState&);
     static Request* create(ExecutionContext*, const String&, const Dictionary&, ExceptionState&);
     static Request* create(ExecutionContext*, Request*, ExceptionState&);
     static Request* create(ExecutionContext*, Request*, const Dictionary&, ExceptionState&);
     static Request* create(ExecutionContext*, FetchRequestData*);
     static Request* create(ExecutionContext*, const WebServiceWorkerRequest&);
@@ skipping 12 matching lines @@
     String credentials() const;
 
     // From Request.idl:
     Request* clone(ExceptionState&) const;
 
     void populateWebServiceWorkerRequest(WebServiceWorkerRequest&) const;
 
     void setBodyBlobHandle(PassRefPtr<BlobDataHandle>);
     bool hasBody() const { return m_request->blobDataHandle(); }
 
-    virtual void trace(Visitor*)  override;
+    void trace(Visitor*) override;
 
 private:
     explicit Request(const Request&);
     Request(ExecutionContext*, FetchRequestData*);
     Request(ExecutionContext*, const WebServiceWorkerRequest&);
 
     static Request* createRequestWithRequestOrString(ExecutionContext*, Request*, const String&, const RequestInit&, ExceptionState&);
     void clearHeaderList();
 
-    virtual PassRefPtr<BlobDataHandle> blobDataHandle() override;
+    PassRefPtr<BlobDataHandle> blobDataHandle() const override;
+    BodyStreamBuffer* buffer() const override;
+    String contentTypeForBuffer() const override;
 
     const Member<FetchRequestData> m_request;
     const Member<Headers> m_headers;
 };
 
 } // namespace blink
 
 #endif // Request_h