Draw marker events on Timeline flame chart

Source/devtools/front_end/profiler/CPUProfileFlameChart.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 93 matching lines @@
 
     /**
      * @return {?WebInspector.FlameChart.TimelineData}
      */
     timelineData: function()
     {
         return this._timelineData || this._calculateTimelineData();
     },
 
     /**
+     * @param {number} startTime
+     * @param {number} endTime
+     * @return {?Array.<!WebInspector.FlameChartDataProvider.Marker>}
+     */
+    timelineMarkers: function(startTime, endTime)
+    {
+        return null;
+    },
+
+    /**
      * @return {?WebInspector.FlameChart.TimelineData}
      */
     _calculateTimelineData: function()
     {
         /**
          * @constructor
          * @param {number} depth
          * @param {number} duration
          * @param {number} startTime
          * @param {number} selfTime
@@ skipping 517 matching lines @@
     {
         var ratio = window.devicePixelRatio;
         this._overviewCanvas.width = width * ratio;
         this._overviewCanvas.height = height * ratio;
         this._overviewCanvas.style.width = width + "px";
         this._overviewCanvas.style.height = height + "px";
     },
 
     __proto__: WebInspector.VBox.prototype
 }