[ServiceWorker] Add support of FetchEvent's request.body.

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 "modules/serviceworkers/FetchBodyStream.h"
 #include "modules/serviceworkers/FetchRequestData.h"
 #include "modules/serviceworkers/Headers.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
@@ skipping 13 matching lines @@
 
     static PassRefPtrWillBeRawPtr<Request> create(PassRefPtrWillBeRawPtr<FetchRequestData>);
 
     static PassRefPtrWillBeRawPtr<Request> create(const WebServiceWorkerRequest&);
 
     PassRefPtrWillBeRawPtr<FetchRequestData> request() { return m_request; }
 
     String method() const;
     String url() const;
     PassRefPtrWillBeRawPtr<Headers> headers() const { return m_headers; }
-    // FIXME: Support body.
+    PassRefPtrWillBeRawPtr<FetchBodyStream> body(ExecutionContext*);
     String referrer() const;
     String mode() const;
     String credentials() const;
 
     void trace(Visitor*);
 
 private:
     explicit Request(PassRefPtrWillBeRawPtr<FetchRequestData>);
     explicit Request(const WebServiceWorkerRequest&);
 
     RefPtrWillBeMember<FetchRequestData> m_request;
     RefPtrWillBeMember<Headers> m_headers;
+    RefPtrWillBeMember<FetchBodyStream> m_fetchBodyStream;
 };
 
 } // namespace blink
 
 #endif // Request_h