[v8 gc] Introduce a base class for all objects that can have pending activity

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InProcessWorkerBase_h
 #define InProcessWorkerBase_h
 
+#include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/MessagePort.h"
 #include "core/events/EventListener.h"
 #include "core/events/EventTarget.h"
 #include "core/workers/AbstractWorker.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
 class ExceptionState;
 class ExecutionContext;
 class WorkerGlobalScopeProxy;
 class WorkerScriptLoader;
 
 // Base class for workers that operate in the same process as the document that
 // creates them.
-class CORE_EXPORT InProcessWorkerBase : public AbstractWorker {
+class CORE_EXPORT InProcessWorkerBase : public AbstractWorker, public ActiveScriptWrappable {
 public:
     ~InProcessWorkerBase() override;
 
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
     void terminate();
 
     // ActiveDOMObject
     void stop() override;
-    bool hasPendingActivity() const override;
+
+    // ActiveScriptWrappable
+    bool hasPendingActivity() const final;
 
     ContentSecurityPolicy* contentSecurityPolicy();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     explicit InProcessWorkerBase(ExecutionContext*);
     bool initialize(ExecutionContext*, const String&, ExceptionState&);
 
     // Creates a proxy to allow communicating with the worker's global scope. InProcessWorkerBase does not take ownership of the
     // created proxy. The proxy is expected to manage its own lifetime, and delete itself in response to terminateWorkerGlobalScope().
     virtual WorkerGlobalScopeProxy* createWorkerGlobalScopeProxy(ExecutionContext*) = 0;
 
 private:
     // Callbacks for m_scriptLoader.
     void onResponse();
     void onFinished();
 
     RefPtr<WorkerScriptLoader> m_scriptLoader;
     RefPtrWillBeMember<ContentSecurityPolicy> m_contentSecurityPolicy;
     WorkerGlobalScopeProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
 };
 
 } // namespace blink
 
 #endif // InProcessWorkerBase_h