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

third_party/WebKit/Source/web/WebDataSourceImpl.h

 /*
  * Copyright (C) 2009 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 63 matching lines @@
 
     PassOwnPtr<WebPluginLoadObserver> releasePluginLoadObserver() { return m_pluginLoadObserver.release(); }
     static void setNextPluginLoadObserver(PassOwnPtr<WebPluginLoadObserver>);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     WebDataSourceImpl(LocalFrame*, const ResourceRequest&, const SubstituteData&);
     ~WebDataSourceImpl() override;
     void detachFromFrame() override;
+    String debugName() const override { return "WebDataSourceImpl"; }
 
     // Mutable because the const getters will magically sync these to the
     // latest version from WebKit.
     mutable WrappedResourceRequest m_originalRequestWrapper;
     mutable WrappedResourceRequest m_requestWrapper;
     mutable WrappedResourceResponse m_responseWrapper;
 
     OwnPtr<ExtraData> m_extraData;
     OwnPtr<WebPluginLoadObserver> m_pluginLoadObserver;
 };
 
 } // namespace blink
 
 #endif  // WebDataSourceImpl_h