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 600f1f968d3e25e94674665f5d5070c0d323ec69..97b0707ed7a7b309e06df1c1f7bee7255daa4421 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.h
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.h
@@ -239,9 +239,9 @@ private:
     // |m_threadState|, |m_runningDebuggerTask| and |m_exitCode|.
     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 completes termination on the worker thread.
     std::unique_ptr<WaitableEvent> m_shutdownEvent;