Timeline: do not imply event.thread.target is the main target

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 205 matching lines @@
     {
         this._overviewPane.requestWindowTimes(windowStartTime, windowEndTime);
     },
 
     /**
      * @return {!WebInspector.TimelineFrameModelBase}
      */
     _frameModel: function()
     {
         if (!this._lazyFrameModel) {
-            var tracingFrameModel = new WebInspector.TracingTimelineFrameModel();
+            var tracingFrameModel = new WebInspector.TracingTimelineFrameModel(this._model.target());
             tracingFrameModel.addTraceEvents(this._model.inspectedTargetEvents(), this._tracingModel.sessionId() || "");
             this._lazyFrameModel = tracingFrameModel;
         }
         return this._lazyFrameModel;
     },
 
     /**
      * @return {!WebInspector.TimelineView}
      */
     _timelineView: function()
@@ skipping 750 matching lines @@
         this.showInDetails(content);
         this._showEventInPaintProfiler(event);
     },
 
     /**
      * @param {!WebInspector.TracingModel.Event} event
      * @param {boolean=} isCloseable
      */
     _showEventInPaintProfiler: function(event, isCloseable)
     {
-        if (!event.picture)
+        var target = this._model.target();
+        if (!event.picture || !target)
             return;
         var paintProfilerView = this._paintProfilerView();
         if (!this._detailsView.hasTab(WebInspector.TimelinePanel.DetailsTab.PaintProfiler))
             this._detailsView.appendTab(WebInspector.TimelinePanel.DetailsTab.PaintProfiler, WebInspector.UIString("Paint Profiler"), paintProfilerView, undefined, undefined, isCloseable);
         this._detailsView.selectTab(WebInspector.TimelinePanel.DetailsTab.PaintProfiler, true);
         event.picture.requestObject(onGotObject);
         function onGotObject(result)
         {
             if (!result || !result["skp64"])
                 return;
-            paintProfilerView.setPicture(event.thread.target(), result["skp64"]);
+            paintProfilerView.setPicture(target, result["skp64"]);
         }
     },
 
     /**
      * @param {number} startTime
      * @param {number} endTime
      */
     _updateSelectedRangeStats: function(startTime, endTime)
     {
         // Return early in case 0 selection window.
@@ skipping 449 matching lines @@
 
 WebInspector.TimelinePanelFactory.prototype = {
     /**
      * @return {!WebInspector.Panel}
      */
     createPanel: function()
     {
         return WebInspector.TimelinePanel._instance();
     }
 }