Add blink::WebWaitableEvent interface (blink side)

Source/core/workers/WorkerThread.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 17 matching lines @@
 #define WorkerThread_h
 
 #include "core/frame/ContentSecurityPolicy.h"
 #include "core/workers/WorkerRunLoop.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
+namespace blink {
+class WebWaitableEvent;
+}
+
 namespace WebCore {
 
     class KURL;
     class NotificationClient;
     class WorkerGlobalScope;
     class WorkerLoaderProxy;
     class WorkerReportingProxy;
     struct WorkerThreadStartupData;
 
     enum WorkerThreadStartMode { DontPauseWorkerGlobalScopeOnStart, PauseWorkerGlobalScopeOnStart };
 
     class WorkerThread : public RefCounted<WorkerThread> {
     public:
         virtual ~WorkerThread();
 
         bool start();
         void stop();
 
+        // Can be used to wait for this worker thread to shut down.
+        // (This is signalled on the main thread, so it's assumed to be waited on the worker context thread)
+        blink::WebWaitableEvent* shutdownEvent() { return m_shutdownEvent.get(); }
+
         bool isCurrentThread() const;
         WorkerRunLoop& runLoop() { return m_runLoop; }
         WorkerLoaderProxy& workerLoaderProxy() const { return m_workerLoaderProxy; }
         WorkerReportingProxy& workerReportingProxy() const { return m_workerReportingProxy; }
 
         // Number of active worker threads.
         static unsigned workerThreadCount();
         static void releaseFastMallocFreeMemoryInAllThreads();
 
         NotificationClient* getNotificationClient() { return m_notificationClient; }
@@ skipping 20 matching lines @@
         WorkerRunLoop m_runLoop;
         WorkerLoaderProxy& m_workerLoaderProxy;
         WorkerReportingProxy& m_workerReportingProxy;
 
         RefPtr<WorkerGlobalScope> m_workerGlobalScope;
         Mutex m_threadCreationMutex;
 
         OwnPtr<WorkerThreadStartupData> m_startupData;
 
         NotificationClient* m_notificationClient;
+
+        // Used to signal thread shutdown.
+        OwnPtr<blink::WebWaitableEvent> m_shutdownEvent;
     };
 
 } // namespace WebCore
 
 #endif // WorkerThread_h