Timeline: show RAIL phase strip unconditionally on actual records being present

third_party/WebKit/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 541 matching lines @@
     _appendGPUEvents: function()
     {
         if (this._appendSyncEvents(this._model.gpuTasks().map(record => record.traceEvent()), WebInspector.UIString("GPU"), this._headerLevel1))
             ++this._currentLevel;
     },
 
     _appendInteractionRecords: function()
     {
         if (!this._irModel)
             return;
-        var segments = this._irModel.interactionRecords();
-        if (!segments || !segments.length)
-            return;
-        segments.forEach(this._appendSegment, this);
+        this._irModel.interactionRecords().forEach(this._appendSegment, this);
         this._entryTypeByLevel[this._currentLevel++] = WebInspector.TimelineFlameChartEntryType.InteractionRecord;
     },
 
     /**
      * @param {!Array.<!WebInspector.TimelineFrame>} frames
      */
     _appendFrameBars: function(frames)
     {
         var style = WebInspector.TimelineUIUtils.markerStyleForFrame();
         this._entryTypeByLevel[this._currentLevel] = WebInspector.TimelineFlameChartEntryType.Frame;
@@ skipping 898 matching lines @@
 /**
   * @constructor
   * @param {!WebInspector.TimelineSelection} selection
   * @param {number} entryIndex
   */
 WebInspector.TimelineFlameChartView.Selection = function(selection, entryIndex)
 {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
 }