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

Source/devtools/front_end/timeline/TracingTimelineModel.js

Index: Source/devtools/front_end/timeline/TracingTimelineModel.js
diff --git a/Source/devtools/front_end/timeline/TracingTimelineModel.js b/Source/devtools/front_end/timeline/TracingTimelineModel.js
index 7284b459a7adaebb9cbfb8240d6949d8ea35a66b..b374128526884ac551511a0a165495f432e07c1d 100644
--- a/Source/devtools/front_end/timeline/TracingTimelineModel.js
+++ b/Source/devtools/front_end/timeline/TracingTimelineModel.js
@@ -231,7 +231,7 @@ WebInspector.TracingTimelineModel.prototype = {
             var threads = process.sortedThreads();
             for (var j = 0; j < threads.length; j++) {
                 var thread = threads[j];
-                if (thread.name() === "WebCore: Worker" && !workerMetadataEvents.some(function(e) { return e.thread === thread; }))
+                if (thread.name() === "WebCore: Worker" && !workerMetadataEvents.some(function(e) { return e.args["data"]["workerThreadId"] === thread.id(); }))
                     continue;
                 this._processThreadEvents(startTime, endTime, event.thread, thread);
             }