Introduce FetchFormDataConsumerHandle.

Source/modules/fetch/FetchBlobDataConsumerHandle.cpp

 // Copyright 2015 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/FetchBlobDataConsumerHandle.h"
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/CrossThreadTask.h"
 #include "core/dom/ExecutionContext.h"
@@ skipping 372 matching lines @@
             if (!m_readerContext->m_blobDataHandleForDrain)
                 return nullptr;
             if (blobSizePolicy == DisallowBlobWithInvalidSize && m_readerContext->m_blobDataHandleForDrain->size() == kuint64max)
                 return nullptr;
             RefPtr<BlobDataHandle> blobDataHandle = m_readerContext->m_blobDataHandleForDrain;
             m_readerContext->setDrained();
             m_readerContext->clearBlobDataHandleForDrain();
             return blobDataHandle.release();
         }
 
+        PassRefPtr<FormData> drainAsFormData() override
+        {
+            RefPtr<BlobDataHandle> handle = drainAsBlobDataHandle(AllowBlobWithInvalidSize);
+            if (!handle)
+                return nullptr;
+            RefPtr<FormData> formData = FormData::create();
+            formData->appendBlob(handle->uuid(), handle);
+            return formData.release();
+        }
+
     private:
         RefPtr<ReaderContext> m_readerContext;
         OwnPtr<WebDataConsumerHandle::Reader> m_reader;
         NotifyOnReaderCreationHelper m_notifier;
     };
 
     ReaderContext(ExecutionContext* executionContext, PassRefPtr<BlobDataHandle> blobDataHandle, FetchBlobDataConsumerHandle::LoaderFactory* loaderFactory)
         : m_blobDataHandleForDrain(blobDataHandle)
         , m_loaderStarted(false)
         , m_drained(false)
@@ skipping 57 matching lines @@
 
     return adoptPtr(new FetchBlobDataConsumerHandle(executionContext, blobDataHandle, new DefaultLoaderFactory));
 }
 
 FetchDataConsumerHandle::Reader* FetchBlobDataConsumerHandle::obtainReaderInternal(Client* client)
 {
     return m_readerContext->obtainReader(client).leakPtr();
 }
 
 } // namespace blink