[Fetch] Request.clone() should reflect body consumption.

Source/modules/fetch/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 "modules/fetch/Request.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
@@ skipping 319 matching lines @@
 }
 
 Request* Request::clone(ExceptionState& exceptionState) const
 {
     if (bodyUsed()) {
         exceptionState.throwTypeError("Request body is already used");
         return nullptr;
     }
 
     FetchRequestData* request = m_request->clone();
+    if (blobDataHandle() && isBodyConsumed()) {
+        // Currently the only methods that can consume body data without
+        // setting 'body passed' flag consume entire body (e.g. text()). Thus
+        // we can set an empty blob to the new request instead of creating a
+        // draining stream.
+        // TODO(yhirano): Fix this once Request.body is introduced.
+        OwnPtr<BlobData> blobData = BlobData::create();
+        blobData->setContentType(blobDataHandle()->type());
+        request->setBlobDataHandle(BlobDataHandle::create(blobData.release(), 0));
+    }
+
     Headers* headers = Headers::create(request->headerList());
     headers->setGuard(m_headers->guard());
     Request* r = new Request(executionContext(), request, headers);
     r->suspendIfNeeded();
     return r;
 }
 
 FetchRequestData* Request::passRequestData()
 {
     ASSERT(!bodyUsed());
@@ skipping 45 matching lines @@
 }
 
 DEFINE_TRACE(Request)
 {
     Body::trace(visitor);
     visitor->trace(m_request);
     visitor->trace(m_headers);
 }
 
 } // namespace blink