Do not coalesce events from different threads having same name

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 147 matching lines @@
             return this._timelineData;
 
         this._timelineData = new WebInspector.FlameChart.TimelineData([], [], []);
 
         this._minimumBoundary = this._model.minimumRecordTime();
         this._timeSpan = this._model.isEmpty() ?  1000 : this._model.maximumRecordTime() - this._minimumBoundary;
         this._currentLevel = 0;
         this._appendFrameBars(this._frameModel.frames());
         this._appendThreadTimelineData(WebInspector.UIString("Main Thread"), this._model.mainThreadEvents());
         var threads = this._model.virtualThreads();
-        for (var threadName in threads) {
-            if (threadName !== WebInspector.TimelineModel.MainThreadName)
-                this._appendThreadTimelineData(threadName, threads[threadName]);
+        for (var i = 0; i < threads.length; i++) {
+            var thread = threads[i];
+            this._appendThreadTimelineData(thread.name, thread.events);
         }
         return this._timelineData;
     },
 
     /**
      * @param {string} headerName
      * @param {!Array.<!WebInspector.TracingModel.Event>} traceEvents
      */
     _appendThreadTimelineData: function(headerName, traceEvents)
     {
@@ skipping 596 matching lines @@
 /**
   * @constructor
   * @param {!WebInspector.TimelineSelection} selection
   * @param {number} entryIndex
   */
 WebInspector.TimelineFlameChart.Selection = function(selection, entryIndex)
 {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
 }