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

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

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
 public:
     explicit MockImageResourceClient(const ResourcePtr<Resource>&);
     ~MockImageResourceClient() override;
 
     void imageChanged(ImageResource*, const IntRect*) override
     {
         m_imageChangedCount++;
     }
 
     void notifyFinished(Resource*) override;
+    String debugName() const override { return "MockImageResourceClient"; }
 
     int imageChangedCount() const { return m_imageChangedCount; }
     bool notifyFinishedCalled() const { return m_notifyFinishedCalled; }
 
     void removeAsClient();
 
 private:
     Resource* m_resource;
     int m_imageChangedCount;
     bool m_notifyFinishedCalled;
 };
 
 } // namespace blink
 
 #endif // MockImageResourceClient_h