Oilpan: Move WorkerClients to the managed heap and trace its supplements.

Source/core/workers/WorkerMessagingProxy.h

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
 
     class WorkerObjectProxy;
     class DedicatedWorkerThread;
     class ExecutionContext;
     class Worker;
     class WorkerClients;
 
     class WorkerMessagingProxy FINAL : public WorkerGlobalScopeProxy, public WorkerLoaderProxy {
         WTF_MAKE_NONCOPYABLE(WorkerMessagingProxy); WTF_MAKE_FAST_ALLOCATED;
     public:
-        WorkerMessagingProxy(Worker*, PassOwnPtr<WorkerClients>);
+        WorkerMessagingProxy(Worker*, PassOwnPtrWillBeRawPtr<WorkerClients>);
 
         // Implementations of WorkerGlobalScopeProxy.
         // (Only use these methods in the worker object thread.)
         virtual void startWorkerGlobalScope(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode) OVERRIDE;
         virtual void terminateWorkerGlobalScope() OVERRIDE;
         virtual void postMessageToWorkerGlobalScope(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>) OVERRIDE;
         virtual bool hasPendingActivity() const OVERRIDE;
         virtual void workerObjectDestroyed() OVERRIDE;
         virtual void connectToInspector(WorkerGlobalScopeProxy::PageInspector*) OVERRIDE;
         virtual void disconnectFromInspector() OVERRIDE;
@@ skipping 31 matching lines @@
         RefPtr<DedicatedWorkerThread> m_workerThread;
 
         unsigned m_unconfirmedMessageCount; // Unconfirmed messages from worker object to worker thread.
         bool m_workerThreadHadPendingActivity; // The latest confirmation from worker thread reported that it was still active.
 
         bool m_askedToTerminate;
 
         Vector<OwnPtr<ExecutionContextTask> > m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
         WorkerGlobalScopeProxy::PageInspector* m_pageInspector;
 
-        OwnPtr<WorkerClients> m_workerClients;
+        OwnPtrWillBePersistent<WorkerClients> m_workerClients;
     };
 
 } // namespace WebCore
 
 #endif // WorkerMessagingProxy_h