DevTools: log worker thread ids on the main thread when Timeline recording is enabled

Source/core/workers/WorkerThread.cpp

Index: Source/core/workers/WorkerThread.cpp
diff --git a/Source/core/workers/WorkerThread.cpp b/Source/core/workers/WorkerThread.cpp
index d21a6c6c4d4d062793166c9034f88de64471dd07..6b444d379c3e6da148216e69ff8901912ea97fad 100644
--- a/Source/core/workers/WorkerThread.cpp
+++ b/Source/core/workers/WorkerThread.cpp
@@ -236,6 +236,13 @@ void WorkerThread::interruptAndDispatchInspectorCommands()
         m_workerInspectorController->interruptAndDispatchInspectorCommands();
 }
 
+PlatformThreadId WorkerThread::platformThreadId() const
+{
+    if (!m_thread)
+        return 0;
+    return m_thread->threadId();
+}
+
 void WorkerThread::initialize()
 {
     KURL scriptURL = m_startupData->m_scriptURL;