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

third_party/WebKit/Source/core/html/PluginDocument.h

Index: third_party/WebKit/Source/core/html/PluginDocument.h
diff --git a/third_party/WebKit/Source/core/html/PluginDocument.h b/third_party/WebKit/Source/core/html/PluginDocument.h
index ff772c6e3d87963621241780015e2ec13cc29c86..f611709c043689de1a8d1fa4ff7a791fbe69db60 100644
--- a/third_party/WebKit/Source/core/html/PluginDocument.h
+++ b/third_party/WebKit/Source/core/html/PluginDocument.h
@@ -54,6 +54,8 @@ private:
 
     PassRefPtrWillBeRawPtr<DocumentParser> createParser() override;
 
+    String debugName() const override { return "PluginDocument"; }
+
     RefPtrWillBeMember<Node> m_pluginNode;
 };