[Blink] [PowerProfiler] Support accuracy level attribute for power data provider.

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 1049 matching lines @@
         var fragment = document.createDocumentFragment();
         fragment.appendChild(WebInspector.TimelineUIUtils.generatePieChart(aggregatedStats));
         var startOffset = startTime - this._model.minimumRecordTime();
         var endOffset = endTime - this._model.minimumRecordTime();
         var title = WebInspector.UIString("%s \u2013 %s", Number.millisToString(startOffset), Number.millisToString(endOffset));
 
         for (var i = 0; i < this._overviewControls.length; ++i) {
             if (this._overviewControls[i] instanceof WebInspector.TimelinePowerOverview) {
                 var energy = this._overviewControls[i].calculateEnergy(startTime, endTime);
                 title += WebInspector.UIString("  Energy: %.2f Joules", energy);
+                title += WebInspector.UIString("  Accuracy: %s", WebInspector.powerProfiler.accuracyLevel());
                 break;
             }
         }
         this.showInDetails(title, fragment);
     },
 
     /**
      * @param {?WebInspector.TimelineSelection} selection
      */
     select: function(selection)
@@ skipping 355 matching lines @@
      * @param {!WebInspector.TimelineModel.Record} record
      * @return {boolean}
      */
     accept: function(record)
     {
         return !this._hiddenRecords[record.type()];
     },
 
     __proto__: WebInspector.TimelineModel.Filter.prototype
 }