Stop dispatching notifyFinished for each part in a multipart response

third_party/WebKit/Source/core/fetch/ImageResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 100 matching lines @@
 
     // ImageObserver
     void decodedSizeChanged(const blink::Image*, int delta) override;
     void didDraw(const blink::Image*) override;
 
     bool shouldPauseAnimation(const blink::Image*) override;
     void animationAdvanced(const blink::Image*) override;
     void changedInRect(const blink::Image*, const IntRect&) override;
 
     // MultipartImageResourceParser::Client
-    void onePartInMultipartReceived(const ResourceResponse&, bool isFirstPart) final;
+    void onePartInMultipartReceived(const ResourceResponse&) final;
     void multipartDataReceived(const char*, size_t) final;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     bool isSafeToUnlock() const override;
     void destroyDecodedDataIfPossible() override;
     void destroyDecodedDataForFailedRevalidation() override;
 
 private:
     explicit ImageResource(blink::Image*);
     ImageResource(const ResourceRequest&, blink::Image*);
 
+    enum class MultipartParsingState : uint8_t {
+        WaitingForFirstPart,
+        ParsingFirstPart,
+        FinishedParsingFirstPart,
+    };
+
     class ImageResourceFactory : public ResourceFactory {
     public:
         ImageResourceFactory()
             : ResourceFactory(Resource::Image) { }
 
         PassRefPtrWillBeRawPtr<Resource> create(const ResourceRequest& request, const String&) const override
         {
             return adoptRefWillBeNoop(new ImageResource(request));
         }
     };
     ImageResource(const ResourceRequest&);
 
     void clear();
 
     void setCustomAcceptHeader();
     void createImage();
     void updateImage(bool allDataReceived);
     void clearImage();
     // If not null, changeRect is the changed part of the image.
     void notifyObservers(const IntRect* changeRect = nullptr);
 
     float m_devicePixelRatioHeaderValue;
 
     PersistentWillBeMember<MultipartImageResourceParser> m_multipartParser;
     RefPtr<blink::Image> m_image;
+    MultipartParsingState m_multipartParsingState = MultipartParsingState::WaitingForFirstPart;
     bool m_hasDevicePixelRatioHeaderValue;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Image);
 
 } // namespace blink
 
 #endif