Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorBaseAgent.cpp

Index: Source/core/inspector/InspectorBaseAgent.cpp
diff --git a/Source/core/inspector/InspectorBaseAgent.cpp b/Source/core/inspector/InspectorBaseAgent.cpp
index e1b4e8abba2be36bf385cb664eba49da646358b2..ee65b9669336dd1a3598f73d4f6ba4e67c58a965 100644
--- a/Source/core/inspector/InspectorBaseAgent.cpp
+++ b/Source/core/inspector/InspectorBaseAgent.cpp
@@ -32,6 +32,7 @@
 #include "core/inspector/InspectorBaseAgent.h"
 
 #include "core/inspector/InspectorState.h"
+#include "core/inspector/InstrumentingAgents.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
@@ -45,6 +46,11 @@ InspectorAgent::~InspectorAgent()
 {
 }
 
+void InspectorAgent::trace(Visitor* visitor)
+{
+    visitor->trace(m_instrumentingAgents);
+}
+
 void InspectorAgent::appended(InstrumentingAgents* instrumentingAgents, InspectorState* inspectorState)
 {
     m_instrumentingAgents = instrumentingAgents;
@@ -58,10 +64,10 @@ InspectorAgentRegistry::InspectorAgentRegistry(InstrumentingAgents* instrumentin
 {
 }
 
-void InspectorAgentRegistry::append(PassOwnPtr<InspectorAgent> agent)
+void InspectorAgentRegistry::append(PassOwnPtrWillBeRawPtr<InspectorAgent> agent)
 {
     agent->appended(m_instrumentingAgents, m_inspectorState->createAgentState(agent->name()));
-    m_agents.append(agent);
+    m_agents.append(agent.get());
 }
 
 void InspectorAgentRegistry::setFrontend(InspectorFrontend* frontend)
@@ -100,5 +106,11 @@ void InspectorAgentRegistry::flushPendingFrontendMessages()
         m_agents[i]->flushPendingFrontendMessages();
 }
 
+void InspectorAgentRegistry::trace(Visitor* visitor)
+{
+    visitor->trace(m_agents);
+    visitor->trace(m_instrumentingAgents);
+}
+
 } // namespace WebCore