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

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

Index: third_party/WebKit/Source/core/css/StyleRuleImport.h
diff --git a/third_party/WebKit/Source/core/css/StyleRuleImport.h b/third_party/WebKit/Source/core/css/StyleRuleImport.h
index ebf0055e1f62301ae2170569f13861e817af9d65..9d1a66551249428919aa30732edf14e9d5a3d575 100644
--- a/third_party/WebKit/Source/core/css/StyleRuleImport.h
+++ b/third_party/WebKit/Source/core/css/StyleRuleImport.h
@@ -67,6 +67,7 @@ private:
         {
             m_ownerRule->setCSSStyleSheet(href, baseURL, charset, sheet);
         }
+        String debugName() const override { return "ImportedStyleSheetClient"; }
     private:
         StyleRuleImport* m_ownerRule;
     };