DevTools: fix aggregated donut chart cache population

third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 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 1028 matching lines @@
    */
   static _filterForStats() {
     var visibleEventsFilter = Timeline.TimelineUIUtils.visibleEventsFilter();
     return event => visibleEventsFilter.accept(event) || SDK.TracingModel.isTopLevelEvent(event);
   }
   /**
    * @param {!TimelineModel.TimelineModel} model
    */
   static _buildRangeStatsCacheIfNeeded(model) {
     var tasks = model.mainThreadTasks();
-    if (tasks.length && tasks[0][Timeline.TimelineUIUtils._categoryBreakdownCacheSymbol])
+    var filter = Timeline.TimelineUIUtils._filterForStats();
+    var firstTask = tasks.find(filter);
+    if (!firstTask || firstTask[Timeline.TimelineUIUtils._categoryBreakdownCacheSymbol])
       return;
     var aggregatedStats = {};
     var ownTimes = [];
     TimelineModel.TimelineModel.forEachEvent(
-        model.mainThreadEvents(), onStartEvent, onEndEvent, undefined, undefined, undefined,
-        Timeline.TimelineUIUtils._filterForStats());
+        model.mainThreadEvents(), onStartEvent, onEndEvent, undefined, undefined, undefined, filter);
 
     /**
      * @param {!SDK.TracingModel.Event} e
      */
     function onStartEvent(e) {
       if (ownTimes.length)
         ownTimes[ownTimes.length - 1] -= e.duration;
       ownTimes.push(e.duration);
     }
 
@@ skipping 1244 matching lines @@
    * @param {string=} warningType
    */
   appendWarningRow(event, warningType) {
     var warning = Timeline.TimelineUIUtils.eventWarning(event, warningType);
     if (warning)
       this.appendElementRow(Common.UIString('Warning'), warning, true);
   }
 };
 
 Timeline.TimelineUIUtils._categoryBreakdownCacheSymbol = Symbol('categoryBreakdownCache');