tracing: Report ResourceClients and the reason for not deletable for web-caches

third_party/WebKit/Source/core/style/StyleFetchedImageSet.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 62 matching lines @@
     PassRefPtr<Image> image(const LayoutObject*, const IntSize&) const override;
     float imageScaleFactor() const override { return m_imageScaleFactor; }
     bool knownToBeOpaque(const LayoutObject*) const override;
     ImageResource* cachedImage() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     StyleFetchedImageSet(ImageResource*, float imageScaleFactor, CSSImageSetValue*);
 
+    String debugName() const override { return "StyleFetchedImageSet"; }
+
     ResourcePtr<ImageResource> m_bestFitImage;
     float m_imageScaleFactor;
 
     RawPtrWillBeMember<CSSImageSetValue> m_imageSetValue; // Not retained; it owns us.
 };
 
 DEFINE_STYLE_IMAGE_TYPE_CASTS(StyleFetchedImageSet, isImageResourceSet());
 
 } // namespace blink
 
 #endif // StyleFetchedImageSet_h