Worker: Move close() from WorkerGlobalScope to derived interfaces

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

 /*
  * Copyright (C) 2008, 2009 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 107 matching lines @@
     WorkerEventQueue* getEventQueue() const final;
     SecurityContext& securityContext() final { return *this; }
 
     bool isContextThread() const final;
     bool isJSExecutionForbidden() const final;
 
     DOMTimerCoordinator* timers() final;
 
     WorkerInspectorController* workerInspectorController() { return m_workerInspectorController.get(); }
 
-    bool isClosing() { return m_closing; }
+    // Returns true when the WorkerGlobalScope is closing (e.g. via close()
+    // method). If this returns true, the worker is going to be shutdown after
+    // the current task execution. Workers that don't support close operation
+    // should always return false.
+    bool isClosing() const { return m_closing; }
 
     double timeOrigin() const { return m_timeOrigin; }
 
     WorkerClients* clients() { return m_workerClients.get(); }
 
     using SecurityContext::getSecurityOrigin;
     using SecurityContext::contentSecurityPolicy;
 
     void addConsoleMessage(ConsoleMessage*) final;
     ConsoleMessageStorage* messageStorage();
@@ skipping 61 matching lines @@
     unsigned long m_workerExceptionUniqueIdentifier;
     HeapHashMap<unsigned long, Member<ConsoleMessage>> m_pendingMessages;
     HeapListHashSet<Member<V8AbstractEventListener>> m_eventListeners;
 };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope, ExecutionContext, context, context->isWorkerGlobalScope(), context.isWorkerGlobalScope());
 
 } // namespace blink
 
 #endif // WorkerGlobalScope_h