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

Source/modules/serviceworkers/Request.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 "Request.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fetch/FetchUtils.h"
@@ skipping 194 matching lines @@
 String Request::url() const
 {
     // The url attribute's getter must return request's url, serialized with the exclude fragment flag set.
     if (!m_request->url().hasFragmentIdentifier())
         return m_request->url();
     KURL url(m_request->url());
     url.removeFragmentIdentifier();
     return url;
 }
 
+PassRefPtrWillBeRawPtr<FetchBodyStream> Request::body(ExecutionContext* context)
+{
+    if (!m_request->blobDataHandle())
+        return nullptr;
+    if (!m_fetchBodyStream)
+        m_fetchBodyStream = FetchBodyStream::create(context, m_request->blobDataHandle());
+    return m_fetchBodyStream;
+}
+
+
 String Request::referrer() const
 {
     // "The referrer attribute's getter must return the empty string if
     // request's referrer is none, and request's referrer, serialized,
     // otherwise."
     return m_request->referrer().referrer().referrer;
 }
 
 String Request::mode() const
 {
@@ skipping 26 matching lines @@
         return "include";
     }
     ASSERT_NOT_REACHED();
     return "";
 }
 
 void Request::trace(Visitor* visitor)
 {
     visitor->trace(m_request);
     visitor->trace(m_headers);
+    visitor->trace(m_fetchBodyStream);
 }
 
 } // namespace blink