Draw marker events on Timeline flame chart

Source/devtools/front_end/profiler/CPUProfileFlameChart.js

Index: Source/devtools/front_end/profiler/CPUProfileFlameChart.js
diff --git a/Source/devtools/front_end/profiler/CPUProfileFlameChart.js b/Source/devtools/front_end/profiler/CPUProfileFlameChart.js
index 10713d9c4c280cdba823614bacd43cf7669a2f22..1d64280dd6b948b40b0b8d25dec55ec66447b5ae 100644
--- a/Source/devtools/front_end/profiler/CPUProfileFlameChart.js
+++ b/Source/devtools/front_end/profiler/CPUProfileFlameChart.js
@@ -111,6 +111,16 @@ WebInspector.CPUFlameChartDataProvider.prototype = {
     },
 
     /**
+     * @param {number} startTime
+     * @param {number} endTime
+     * @return {?Array.<!WebInspector.FlameChartDataProvider.Marker>}
+     */
+    timelineMarkers: function(startTime, endTime)
+    {
+        return null;
+    },
+
+    /**
      * @return {?WebInspector.FlameChart.TimelineData}
      */
     _calculateTimelineData: function()