Revert of Remove WorkerBackingThread::scriptCount

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 aea4cb257214bcc22b1d270c49493e888ff5d068..3a1de279867b357456c7c840563a261077303a49 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.h
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.h
@@ -34,7 +34,6 @@
 #include "core/workers/WorkerLoaderProxy.h"
 #include "core/workers/WorkerThreadLifecycleObserver.h"
 #include "platform/LifecycleNotifier.h"
-#include "platform/WaitableEvent.h"
 #include "wtf/Forward.h"
 #include "wtf/Functional.h"
 #include "wtf/OwnPtr.h"
@@ -44,6 +43,7 @@
 namespace blink {
 
 class InspectorTaskRunner;
+class WaitableEvent;
 class WorkerBackingThread;
 class WorkerGlobalScope;
 class WorkerInspectorController;
@@ -152,21 +152,12 @@
 
     ExitCode getExitCode();
 
-    void waitForShutdownForTesting() { m_shutdownEvent->wait(); }
-
 protected:
     WorkerThread(PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&);
 
     // Factory method for creating a new worker context for the thread.
     // Called on the worker thread.
     virtual WorkerGlobalScope* createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData>) = 0;
-
-    // Returns true when this WorkerThread owns the associated
-    // WorkerBackingThread exclusively. If this function returns true, the
-    // WorkerThread initializes / shutdowns the backing thread. Otherwise
-    // workerBackingThread() should be initialized / shutdown properly
-    // out of this class.
-    virtual bool isOwningBackingThread() const { return true; }
 
     // Called on the worker thread.
     virtual void postInitialize() { }