DevTools: move recurring flag into AsyncTask, control cancelation from embedder only.

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 319 matching lines @@
         e._blackboxRoot = true;
       }
       if (title) {
         this._appendHeader(title, style, forceExpanded);
         title = '';
       }
 
       var level = this._currentLevel + openEvents.length;
       if (flowEventsEnabled)
         this._appendFlowEvent(e, level);
-      this._appendEvent(e, level);
+      if (e.phase !== SDK.TracingModel.Phase.FlowEnd)
+        this._appendEvent(e, level);
       if (!isExtension && TimelineModel.TimelineModel.isMarkerEvent(e))
         this._timelineData.entryTotalTimes[this._entryData.length] = undefined;
 
       maxStackDepth = Math.max(maxStackDepth, openEvents.length + 1);
       if (e.endTime)
         openEvents.push(e);
     }
     this._entryTypeByLevel.length = this._currentLevel + maxStackDepth;
     this._entryTypeByLevel.fill(entryType, this._currentLevel);
     this._currentLevel += maxStackDepth;
@@ skipping 410 matching lines @@
 
     switch (event.phase) {
       case SDK.TracingModel.Phase.FlowBegin:
         this._flowEventIndexById.set(event.id, pushStartFlow(event));
         break;
       case SDK.TracingModel.Phase.FlowStep:
         pushEndFlow(event, this._flowEventIndexById.get(event.id));
         this._flowEventIndexById.set(event.id, pushStartFlow(event));
         break;
       case SDK.TracingModel.Phase.FlowEnd:
-        pushEndFlow(event, this._flowEventIndexById.get(event.id));
         this._flowEventIndexById.delete(event.id);
         break;
     }
   }
 
   /**
    * @param {!TimelineModel.TimelineFrame} frame
    */
   _appendFrame(frame) {
     var index = this._entryData.length;
@@ skipping 86 matching lines @@
    * @return {boolean}
    */
   _isVisible(event) {
     return this._filters.every(function(filter) {
       return filter.accept(event);
     });
   }
 };
 
 Timeline.TimelineFlameChartDataProvider.InstantEventVisibleDurationMs = 0.001;