Oilpan: Prepare moving InspectorAgent related classes to oilpan

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 78a2c19c3d0c77642d598006561463825eae2e98..50f9d769bd096ca8d9270ad017d1b9ba0a2594a5 100644
--- a/Source/core/inspector/InspectorBaseAgent.cpp
+++ b/Source/core/inspector/InspectorBaseAgent.cpp
@@ -43,11 +43,15 @@ InspectorAgent::InspectorAgent(const String& name)
 
 InspectorAgent::~InspectorAgent()
 {
+#if ENABLE(OILPAN)
+    m_state = nullptr;
+#endif
 }
 
 void InspectorAgent::trace(Visitor* visitor)
 {
     visitor->trace(m_instrumentingAgents);
+    visitor->trace(m_state);
 }
 
 void InspectorAgent::appended(InstrumentingAgents* instrumentingAgents, InspectorState* inspectorState)
@@ -108,6 +112,7 @@ void InspectorAgentRegistry::flushPendingFrontendMessages()
 void InspectorAgentRegistry::trace(Visitor* visitor)
 {
     visitor->trace(m_instrumentingAgents);
+    visitor->trace(m_inspectorState);
 #if ENABLE(OILPAN)
     visitor->trace(m_agents);
 #endif