Introduce FetchFormDataConsumerHandle.

Source/modules/fetch/FetchFormDataConsumerHandle.h

+// 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.
+
+#ifndef FetchFormDataConsumerHandle_h
+#define FetchFormDataConsumerHandle_h
+
+#include "core/dom/DOMArrayBuffer.h"
+#include "core/dom/DOMArrayBufferView.h"
+#include "modules/ModulesExport.h"
+#include "modules/fetch/FetchBlobDataConsumerHandle.h"
+#include "modules/fetch/FetchDataConsumerHandle.h"
+#include "platform/blob/BlobData.h"
+#include "platform/network/FormData.h"
+#include "wtf/Forward.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+#include "wtf/ThreadSafeRefCounted.h"
+
+namespace blink {
+
+class ExecutionContext;
+
+// FetchFormDataConsumerHandle is a handle made from a FormData. It provides
+// drainAsFormData in the associated Reader.
+class MODULES_EXPORT FetchFormDataConsumerHandle final : public FetchDataConsumerHandle {
+    WTF_MAKE_NONCOPYABLE(FetchFormDataConsumerHandle);
+public:
+    static PassOwnPtr<FetchDataConsumerHandle> create(const String& body);
+    static PassOwnPtr<FetchDataConsumerHandle> create(PassRefPtr<DOMArrayBuffer> body);
+    static PassOwnPtr<FetchDataConsumerHandle> create(PassRefPtr<DOMArrayBufferView> body);
+    static PassOwnPtr<FetchDataConsumerHandle> create(const void* data, size_t);
+    static PassOwnPtr<FetchDataConsumerHandle> create(ExecutionContext*, PassRefPtr<FormData> body);
+    // Use FetchBlobDataConsumerHandle for blobs.
+
+    ~FetchFormDataConsumerHandle() override;
+
+    static PassOwnPtr<FetchDataConsumerHandle> createForTest(
+        ExecutionContext*,
+        PassRefPtr<FormData> body,
+        FetchBlobDataConsumerHandle::LoaderFactory*);
+
+private:
+    class Context;
+    class SimpleContext;
+    class ComplexContext;
+    class ReaderImpl;
+
+    explicit FetchFormDataConsumerHandle(const String& body);
+    FetchFormDataConsumerHandle(const void*, size_t);
+    FetchFormDataConsumerHandle(ExecutionContext*, const PassRefPtr<FormData> body, FetchBlobDataConsumerHandle::LoaderFactory* = nullptr);
+
+    Reader* obtainReaderInternal(Client*) override;
+
+    const char* debugName() const override { return "FetchFormDataConsumerHandle"; }
+
+    RefPtr<Context> m_context;
+};
+
+} // namespace blink
+
+#endif // FetchFormDataConsumerHandle_h