Use timer task runner for V8PerIsolate tasks

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 5a5842220c4b2fa1e1c0fc10f75a177b9bdd3588..3f79258bcb29de8bf74128bf6f05d0cefe2d5daf 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -64,7 +64,8 @@ WorkerBackingThread::~WorkerBackingThread() {}
 void WorkerBackingThread::initialize() {
   DCHECK(!m_isolate);
   m_backingThread->initialize();
-  m_isolate = V8PerIsolateData::initialize();
+  m_isolate = V8PerIsolateData::initialize(
+      m_backingThread->platformThread().getWebTaskRunner());
   addWorkerIsolate(m_isolate);
   V8Initializer::initializeWorker(m_isolate);