Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/PageConsoleAgent.cpp

 /*
  * Copyright (C) 2011 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 29 matching lines @@
 namespace WebCore {
 
 PageConsoleAgent::PageConsoleAgent(InjectedScriptManager* injectedScriptManager, InspectorDOMAgent* domAgent, InspectorTimelineAgent* timelineAgent)
     : InspectorConsoleAgent(timelineAgent, injectedScriptManager)
     , m_inspectorDOMAgent(domAgent)
 {
 }
 
 PageConsoleAgent::~PageConsoleAgent()
 {
-    m_inspectorDOMAgent = 0;
+#if !ENABLE(OILPAN)
+    m_inspectorDOMAgent = nullptr;
+#endif
+}
+
+void PageConsoleAgent::trace(Visitor* visitor)
+{
+    visitor->trace(m_inspectorDOMAgent);
+    InspectorConsoleAgent::trace(visitor);
 }
 
 void PageConsoleAgent::clearMessages(ErrorString* errorString)
 {
     m_inspectorDOMAgent->releaseDanglingNodes();
     InspectorConsoleAgent::clearMessages(errorString);
 }
 
 class InspectableNode FINAL : public InjectedScriptHost::InspectableObject {
 public:
@@ skipping 17 matching lines @@
         Node& ancestor = node->highestAncestorOrSelf();
         if (!ancestor.isShadowRoot() || toShadowRoot(ancestor).type() == ShadowRoot::AuthorShadowRoot)
             break;
         // User agent shadow root, keep climbing up.
         node = toShadowRoot(ancestor).host();
     }
     m_injectedScriptManager->injectedScriptHost()->addInspectedObject(adoptPtr(new InspectableNode(node)));
 }
 
 } // namespace WebCore