[ServiceWorker] Make fetch() method better conformance with the spec.

Source/modules/serviceworkers/FetchRequestData.cpp

 // 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.
 
 #include "config.h"
 #include "FetchRequestData.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fetch/ResourceLoaderOptions.h"
@@ skipping 49 matching lines @@
         request->m_referrer.setClient(blink::Referrer(context->url().strippedForUseAsReferrer(), toDocument(context)->referrerPolicy()));
     else
         request->m_referrer.setClient(blink::Referrer(context->url().strippedForUseAsReferrer(), ReferrerPolicyDefault));
     request->m_context = ConnectContext;
     request->m_mode = m_mode;
     request->m_credentials = m_credentials;
     // "2. Return |r|."
     return request.release();
 }
 
+PassRefPtrWillBeRawPtr<FetchRequestData> FetchRequestData::createCopy() const
+{
+    RefPtrWillBeRawPtr<FetchRequestData> request = FetchRequestData::create();
+    request->m_url = m_url;
+    request->m_method = m_method;
+    request->m_headerList = m_headerList->createCopy();
+    request->m_unsafeRequestFlag = m_unsafeRequestFlag;
+    // FIXME: Support body.
+    request->m_origin = m_origin;
+    request->m_sameOriginDataURLFlag = m_sameOriginDataURLFlag;
+    request->m_context = m_context;
+    request->m_referrer = m_referrer;
+    request->m_mode = m_mode;
+    request->m_credentials = m_credentials;
+    request->m_responseTainting = m_responseTainting;
+    return request.release();
+}
+
 FetchRequestData::~FetchRequestData()
 {
 }
 
 FetchRequestData::FetchRequestData()
     : m_method("GET")
     , m_headerList(FetchHeaderList::create())
     , m_unsafeRequestFlag(false)
     , m_context(NullContext)
     , m_sameOriginDataURLFlag(false)
     , m_mode(NoCORSMode)
     , m_credentials(OmitCredentials)
     , m_responseTainting(BasicTainting)
 {
 }
 
 void FetchRequestData::trace(Visitor* visitor)
 {
     visitor->trace(m_headerList);
 }
 
 } // namespace blink