Check if Persistent owner thread matches pointer thread and current thread

third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
index 436ccc62f1f9b8f7f08eb526f8ce82b641d50bca..e99a78ae07f069e6da02503371368ff8fa3e6906 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -68,10 +68,10 @@ WorkerBackingThread::~WorkerBackingThread()
 void WorkerBackingThread::initialize()
 {
     DCHECK(!m_isolate);
+    m_backingThread->initialize();
     m_isolate = V8PerIsolateData::initialize();
     addWorkerIsolate(m_isolate);
     V8Initializer::initializeWorker(m_isolate);
-    m_backingThread->initialize();
 
     std::unique_ptr<V8IsolateInterruptor> interruptor = wrapUnique(new V8IsolateInterruptor(m_isolate));
     ThreadState::current()->addInterruptor(std::move(interruptor));