Add tests to FetchBlobDataConsumerHandle

Source/modules/fetch/FetchDataConsumerHandle.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 FetchDataConsumerHandle_h
 #define FetchDataConsumerHandle_h
 
+#include "modules/ModulesExport.h"
 #include "platform/blob/BlobData.h"
 #include "public/platform/WebDataConsumerHandle.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 // This is an interface class that adds Reader's blobDataHandle() to
 // WebDataConsumerHandle.
 // This class works not very well with Oilpan: As this class is not garbage
 // collected while many clients or related objects may be, it is very easy
 // to create a reference cycle. When an client is garbage collected, making
 // the client own the handle is the right way.
-class FetchDataConsumerHandle : public WebDataConsumerHandle {
+class MODULES_EXPORT FetchDataConsumerHandle : public WebDataConsumerHandle {
 public:
     class Reader : public WebDataConsumerHandle::Reader {
     public:
         enum BlobSizePolicy {
             // The returned blob must have a valid size (i.e. != kuint64max).
             DisallowBlobWithInvalidSize,
             // The returned blob can have an invalid size.
             AllowBlobWithInvalidSize
         };
 
@@ skipping 14 matching lines @@
     // unique_ptr in both Blink and Chromium.
     PassOwnPtr<Reader> obtainReader(Client* client) { return adoptPtr(obtainReaderInternal(client)); }
 
 private:
     Reader* obtainReaderInternal(Client*) override = 0;
 };
 
 } // namespace blink
 
 #endif // FetchDataConsumerHandle_h