[Fetch API] Send request body as a FormData.

Source/modules/fetch/BodyStreamBuffer.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/BodyStreamBuffer.h"
 
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/fetch/DataConsumerHandleUtil.h"
 #include "platform/blob/BlobData.h"
+#include "platform/network/FormData.h"
 
 namespace blink {
 
 class BodyStreamBuffer::LoaderHolder final : public GarbageCollectedFinalized<LoaderHolder>, public ActiveDOMObject, public FetchDataLoader::Client {
     WTF_MAKE_NONCOPYABLE(LoaderHolder);
     USING_GARBAGE_COLLECTED_MIXIN(LoaderHolder);
 public:
     LoaderHolder(ExecutionContext* executionContext, BodyStreamBuffer* buffer, FetchDataLoader* loader, FetchDataLoader::Client* client)
         : ActiveDOMObject(executionContext)
         , m_buffer(buffer)
@@ skipping 87 matching lines @@
         return nullptr;
 
     RefPtr<BlobDataHandle> blobDataHandle = m_reader->drainAsBlobDataHandle(policy);
     if (blobDataHandle) {
         close();
         return blobDataHandle.release();
     }
     return nullptr;
 }
 
+PassRefPtr<FormData> BodyStreamBuffer::drainAsFormData()
+{
+    ASSERT(!isLocked());
+    if (ReadableStream::Closed == m_stream->stateInternal() || ReadableStream::Errored == m_stream->stateInternal())
+        return nullptr;
+
+    RefPtr<FormData> formData = m_reader->drainAsFormData();
+    if (formData) {
+        close();
+        return formData.release();
+    }
+    return nullptr;
+}
+
 PassOwnPtr<FetchDataConsumerHandle> BodyStreamBuffer::lock(ExecutionContext* executionContext)
 {
     ASSERT(!isLocked());
     ++m_lockLevel;
     m_reader = nullptr;
     OwnPtr<FetchDataConsumerHandle> handle = m_handle.release();
     if (ReadableStream::Closed == m_stream->stateInternal() || !m_hasBody)
         return createFetchDataConsumerHandleFromWebHandle(createDoneDataConsumerHandle());
     if (ReadableStream::Errored == m_stream->stateInternal())
         return createFetchDataConsumerHandleFromWebHandle(createUnexpectedErrorDataConsumerHandle());
@@ skipping 109 matching lines @@
     unlock();
     if (mode == EndLoadingDone) {
         close();
     } else {
         ASSERT(mode == EndLoadingErrored);
         error();
     }
 }
 
 } // namespace blink