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

Source/core/inspector/InspectorTraceEvents.h

Index: Source/core/inspector/InspectorTraceEvents.h
diff --git a/Source/core/inspector/InspectorTraceEvents.h b/Source/core/inspector/InspectorTraceEvents.h
index a08fcf3cfdb34c215238c9877df24ff4e71153c3..5cb8cd235a3b62a7b70e009791d7bc549d370b31 100644
--- a/Source/core/inspector/InspectorTraceEvents.h
+++ b/Source/core/inspector/InspectorTraceEvents.h
@@ -26,6 +26,7 @@ class ResourceRequest;
 class ResourceResponse;
 class ScriptSourceCode;
 class ScriptCallStack;
+class WorkerThread;
 class XMLHttpRequest;
 
 class InspectorLayoutEvent {
@@ -149,6 +150,11 @@ public:
     static PassRefPtr<TraceEvent::ConvertableToTraceFormat> data(ExecutionContext*, const String& message);
 };
 
+class InspectorTracingStartedInWorkerEvent {
+public:
+    static PassRefPtr<TraceEvent::ConvertableToTraceFormat> data(const String& sessionId, WorkerThread*);
+};
+
 } // namespace blink