DevTools: Use proper target when processing worker thread events.

third_party/WebKit/Source/devtools/front_end/timeline/TimelineFlameChart.js

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 339 matching lines @@
     {
         var entryType = this._entryType(entryIndex);
         if (entryType === WebInspector.TimelineFlameChartEntryType.Event) {
             var event = /** @type {!WebInspector.TracingModel.Event} */ (this._entryData[entryIndex]);
             if (event.phase === WebInspector.TracingModel.Phase.AsyncStepInto || event.phase === WebInspector.TracingModel.Phase.AsyncStepPast)
                 return event.name + ":" + event.args["step"];
             if (event._blackboxRoot)
                 return WebInspector.UIString("Blackboxed");
             var name = WebInspector.TimelineUIUtils.eventStyle(event).title;
             // TODO(yurys): support event dividers
-            var detailsText = WebInspector.TimelineUIUtils.buildDetailsTextForTraceEvent(event, this._model.target());
+            var detailsText = WebInspector.TimelineUIUtils.buildDetailsTextForTraceEvent(event, this._model.targetByEvent(event));
             if (event.name === WebInspector.TimelineModel.RecordType.JSFrame && detailsText)
                 return detailsText;
             return detailsText ? WebInspector.UIString("%s (%s)", name, detailsText) : name;
         }
         var title = this._entryIndexToTitle[entryIndex];
         if (!title) {
             title = WebInspector.UIString("Unexpected entryIndex %d", entryIndex);
             console.error(title);
         }
         return title;
@@ skipping 1145 matching lines @@
 /**
   * @constructor
   * @param {!WebInspector.TimelineSelection} selection
   * @param {number} entryIndex
   */
 WebInspector.TimelineFlameChartView.Selection = function(selection, entryIndex)
 {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
 }