[Fetch API] Send request body as a FormData.

Source/modules/fetch/BodyStreamBuffer.h

 // 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.
 
 #ifndef BodyStreamBuffer_h
 #define BodyStreamBuffer_h
 
 #include "core/dom/DOMException.h"
 #include "core/streams/ReadableByteStream.h"
 #include "core/streams/ReadableByteStreamReader.h"
 #include "core/streams/UnderlyingSource.h"
 #include "modules/ModulesExport.h"
 #include "modules/fetch/FetchDataConsumerHandle.h"
 #include "modules/fetch/FetchDataLoader.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebDataConsumerHandle.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class ExecutionContext;
+class FormData;
 
 // A BodyStreamBuffer constructed with a null handle is said to have null body.
 // One can observe if a buffer has null body by calling |hasBody| function.
 // |stream| function returns a non-null stream even when the buffer has null
 // body.
 class MODULES_EXPORT BodyStreamBuffer final : public GarbageCollectedFinalized<BodyStreamBuffer>, public UnderlyingSource, public WebDataConsumerHandle::Client {
     WTF_MAKE_NONCOPYABLE(BodyStreamBuffer);
     USING_GARBAGE_COLLECTED_MIXIN(BodyStreamBuffer);
 public:
     BodyStreamBuffer() : BodyStreamBuffer(nullptr) {}
     // |handle| can be null, but cannot be locked.
     explicit BodyStreamBuffer(PassOwnPtr<FetchDataConsumerHandle> /* handle */);
 
     ReadableByteStream* stream() { return m_stream; }
 
     // Callable only when not locked.
     PassRefPtr<BlobDataHandle> drainAsBlobDataHandle(FetchDataConsumerHandle::Reader::BlobSizePolicy);
+    PassRefPtr<FormData> drainAsFormData();
 
     // Callable only when not locked. Returns a non-null handle even when
     // having null body.
     // Note: There is a case that calling |lock| doesn't make the buffer
     // locked. |unlock| should be called even in such cases when a user finishes
     // to use the returned handle, in order to maintain hasPendingActivity().
     PassOwnPtr<FetchDataConsumerHandle> lock(ExecutionContext*);
 
     // This function will lock |this| object. |client| cannot be null.
     void startLoading(ExecutionContext*, FetchDataLoader*, FetchDataLoader::Client* /* client */);
@@ skipping 38 matching lines @@
     // although we should return true for hasPendingActivity() when someone
     // calls |startLoading| but the loding is not yet done.
     unsigned m_lockLevel;
     const bool m_hasBody;
     bool m_streamNeedsMore;
 };
 
 } // namespace blink
 
 #endif // BodyStreamBuffer_h