Remove WorkerBackingThread::scriptCount

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp

Index: third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp
diff --git a/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp b/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp
index 2458e8af75c6f2bf7796ad32a3655d418342a5f8..de797adf0bd59754688ba70c3dbda8872bb9bee5 100644
--- a/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp
+++ b/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp
@@ -15,6 +15,7 @@
 #include "platform/WaitableEvent.h"
 #include "platform/WebThreadSupportingGC.h"
 #include "public/platform/Platform.h"
+#include "wtf/Assertions.h"
 
 namespace blink {
 
@@ -39,20 +40,10 @@ public:
             s_instance = new BackingThreadHolder;
     }
 
-    static void terminateExecution()
-    {
-        MutexLocker locker(holderInstanceMutex());
-        if (s_instance && s_instance->m_initialized) {
-            s_instance->thread()->isolate()->TerminateExecution();
-            s_instance->m_terminatingExecution = true;
-        }
-    }
-
     static void clear()
     {
         MutexLocker locker(holderInstanceMutex());
         if (s_instance) {
-            DCHECK(!s_instance->m_initialized || s_instance->m_terminatingExecution);
             s_instance->shutdownAndWait();
             delete s_instance;
             s_instance = nullptr;
@@ -85,8 +76,8 @@ private:
     void initializeOnThread()
     {
         MutexLocker locker(holderInstanceMutex());
-        DCHECK_EQ(0u, m_thread->workerScriptCount()) << "BackingThreadHolder should be the first to attach to WorkerBackingThread";
-        m_thread->attach();
+        DCHECK(!m_initialized);
+        m_thread->initialize();
         m_initialized = true;
     }
 
@@ -100,13 +91,11 @@ private:
 
     void shutdownOnThread(WaitableEvent* doneEvent)
     {
-        DCHECK_EQ(1u, m_thread->workerScriptCount()) << "BackingThreadHolder should be the last to detach from WorkerBackingThread";
-        m_thread->detach();
+        m_thread->shutdown();
         doneEvent->signal();
     }
 
     OwnPtr<WorkerBackingThread> m_thread;
-    bool m_terminatingExecution = false;
     bool m_initialized = false;
 
     static BackingThreadHolder* s_instance;
@@ -151,12 +140,6 @@ void CompositorWorkerThread::ensureSharedBackingThread()
     BackingThreadHolder::ensureInstance();
 }
 
-void CompositorWorkerThread::terminateExecution()
-{
-    DCHECK(isMainThread());
-    BackingThreadHolder::terminateExecution();
-}
-
 void CompositorWorkerThread::clearSharedBackingThread()
 {
     DCHECK(isMainThread());