[1b] Implement FetchBlobDataConsumerHandle

Source/modules/fetch/FetchBlobDataConsumerHandle.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 FetchBlobDataConsumerHandle_h
+#define FetchBlobDataConsumerHandle_h
+
+#include "core/fetch/ResourceLoaderOptions.h"
+#include "core/loader/ThreadableLoader.h"
+#include "modules/fetch/FetchDataConsumerHandle.h"
+#include "platform/blob/BlobData.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class ExecutionContext;
+
+// This class is not final for testing.
+class FetchBlobDataConsumerHandle : public FetchDataConsumerHandle {
+public:
+    static PassOwnPtr<FetchDataConsumerHandle> create(ExecutionContext*, PassRefPtr<BlobDataHandle>);
+
+private:
+    FetchBlobDataConsumerHandle(ExecutionContext*, PassRefPtr<BlobDataHandle>);
+    Reader* obtainReaderInternal(Client*) override;
+
+    virtual const char* debugName() const override { return "FetchBlobDataConsumerHandle"; }
+
+    class ReaderContext;
+    RefPtr<ReaderContext> m_readerContext;
+};
+
+} // namespace blink
+
+#endif // FetchBlobDataConsumerHandle_h