Remove resource type-specific fetching logic from ResourceFetcher

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 16 matching lines @@
 #include "core/fetch/ResourcePtr.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/IntSizeHash.h"
 #include "platform/geometry/LayoutSize.h"
 #include "platform/graphics/ImageObserver.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
 class ImageResourceClient;
+class FetchRequest;
 class ResourceFetcher;
 class FloatSize;
 class Length;
 class MemoryCache;
 class LayoutObject;
 class SecurityOrigin;
 class SVGImageForContainer;
 
 class CORE_EXPORT ImageResource final : public Resource, public ImageObserver {
     friend class MemoryCache;
 
 public:
     typedef ImageResourceClient ClientType;
 
-    ImageResource(const ResourceRequest&);
+    static ResourcePtr<ImageResource> fetch(FetchRequest&, ResourceFetcher*);
+
     ImageResource(blink::Image*);
     // Exposed for testing
     ImageResource(const ResourceRequest&, blink::Image*);
     virtual ~ImageResource();
 
     virtual void load(ResourceFetcher*, const ResourceLoaderOptions&) override;
 
     blink::Image* image(); // Returns the nullImage() if the image is not available yet.
     blink::Image* imageForLayoutObject(const LayoutObject*); // Returns the nullImage() if the image is not available yet.
     bool hasImage() const { return m_image.get(); }
@@ skipping 49 matching lines @@
 
     virtual bool shouldPauseAnimation(const blink::Image*) override;
     virtual void animationAdvanced(const blink::Image*) override;
     virtual void changedInRect(const blink::Image*, const IntRect&) override;
 
 protected:
     virtual bool isSafeToUnlock() const override;
     virtual void destroyDecodedDataIfPossible() override;
 
 private:
+    static void preCacheDataURIImage(const FetchRequest&, ResourceFetcher*);
+
+    class ImageResourceFactory : public ResourceFactory {
+    public:
+        ImageResourceFactory()
+            : ResourceFactory(Resource::Image) { }
+
+        Resource* create(const ResourceRequest& request, const String&) const override
+        {
+            return 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);
     IntSize svgImageSizeForLayoutObject(const LayoutObject*) const;
     blink::Image* svgImageForLayoutObject(const LayoutObject*);
     bool loadingMultipartContent() const;
 
     float m_devicePixelRatioHeaderValue;
 
     typedef HashMap<const ImageResourceClient*, RefPtr<SVGImageForContainer>> ImageForContainerMap;
     OwnPtr<ImageForContainerMap> m_imageForContainerMap;
 
     RefPtr<blink::Image> m_image;
     bool m_hasDevicePixelRatioHeaderValue;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Image);
 
 }
 
 #endif