Prepare CompositorWorker for per thread heap

third_party/WebKit/Source/core/workers/WorkerThread.h

Index: third_party/WebKit/Source/core/workers/WorkerThread.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerThread.h b/third_party/WebKit/Source/core/workers/WorkerThread.h
index ef70bad4406db28836f50ea1f33c75887c824a1f..64eff807e6ac60e5beb31efd4781f7701061b222 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.h
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.h
@@ -236,9 +236,9 @@ private:
     // |m_runningDebuggerTask|, |m_exitCode| and |m_microtaskRunner|.
     Mutex m_threadStateMutex;
 
-    Persistent<ConsoleMessageStorage> m_consoleMessageStorage;
-    Persistent<WorkerOrWorkletGlobalScope> m_globalScope;
-    Persistent<WorkerInspectorController> m_workerInspectorController;
+    CrossThreadPersistent<ConsoleMessageStorage> m_consoleMessageStorage;
+    CrossThreadPersistent<WorkerOrWorkletGlobalScope> m_globalScope;
+    CrossThreadPersistent<WorkerInspectorController> m_workerInspectorController;
 
     // Signaled when the thread starts termination on the main thread.
     std::unique_ptr<WaitableEvent> m_terminationEvent;