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

third_party/WebKit/Source/core/css/CSSCrossfadeValue.h

 /*
  * Copyright (C) 2011 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 79 matching lines @@
             : m_ownerValue(ownerValue)
             , m_ready(false) { }
 
         ~CrossfadeSubimageObserverProxy() override { }
         DEFINE_INLINE_TRACE()
         {
             visitor->trace(m_ownerValue);
         }
 
         void imageChanged(ImageResource*, const IntRect* = nullptr) override;
+        String debugName() const override { return "CrossfadeSubimageObserverProxy"; }
         void setReady(bool ready) { m_ready = ready; }
     private:
         RawPtrWillBeMember<CSSCrossfadeValue> m_ownerValue;
         bool m_ready;
     };
 
     void crossfadeChanged(const IntRect&);
 
     RefPtrWillBeMember<CSSValue> m_fromValue;
     RefPtrWillBeMember<CSSValue> m_toValue;
     RefPtrWillBeMember<CSSPrimitiveValue> m_percentageValue;
 
     ResourcePtr<ImageResource> m_cachedFromImage;
     ResourcePtr<ImageResource> m_cachedToImage;
 
     RefPtr<Image> m_generatedImage;
 
     CrossfadeSubimageObserverProxy m_crossfadeSubimageObserver;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCrossfadeValue, isCrossfadeValue());
 
 } // namespace blink
 
 #endif // CSSCrossfadeValue_h