DevTools: draw load/first paint marks as tall vertical delimiters

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 138 matching lines @@
      * @override
      * @param {number} index
      * @return {string}
      */
     markerTitle: function(index)
     {
         var event = this._markerEvents[index];
         return WebInspector.TracingTimelineUIUtils.eventTitle(event, this._model);
     },
 
+    /**
+     * @override
+     * @param {number} index
+     * @return {boolean}
+     */
+    isTallMarker: function(index)
+    {
+        var event = this._markerEvents[index];
+        return WebInspector.TracingTimelineUIUtils.isTallMarkerEvent(event);
+    },
+
     reset: function()
     {
         this._timelineData = null;
         /** @type {!Array.<!WebInspector.TracingModel.Event>} */
         this._entryEvents = [];
         this._entryIndexToTitle = {};
         this._markerEvents = [];
         this._entryIndexToFrame = {};
         this._asyncColorByCategory = {};
     },
@@ skipping 733 matching lines @@
 /**
   * @constructor
   * @param {!WebInspector.TimelineSelection} selection
   * @param {number} entryIndex
   */
 WebInspector.TimelineFlameChart.Selection = function(selection, entryIndex)
 {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
 }