DevTools: Add initiator field to timeline network events

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

 /*
  * Copyright (C) 2012 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 806 matching lines @@
 
         if (eventStack.length && eventStack.peekLast().name === recordTypes.EventDispatch)
             eventStack.peekLast().hasChildren = true;
         this._asyncEventTracker.processEvent(event);
         if (event.initiator && event.initiator.url)
             event.url = event.initiator.url;
         switch (event.name) {
         case recordTypes.ResourceSendRequest:
         case recordTypes.WebSocketCreate:
             event.url = event.args["data"]["url"];
+            event.initiator = eventStack.peekLast() || null;
             break;
 
         case recordTypes.ScheduleStyleRecalculation:
             this._lastScheduleStyleRecalculation[event.args["data"]["frame"]] = event;
             break;
 
         case recordTypes.UpdateLayoutTree:
         case recordTypes.RecalculateStyles:
             this._invalidationTracker.didRecalcStyle(event);
             if (event.args["beginData"])
@@ skipping 881 matching lines @@
         if (!id)
             return;
         /** @type {!Map<string, !WebInspector.TracingModel.Event>|undefined} */
         var initiatorMap = this._initiatorByType.get(initiatorType);
         if (isInitiator)
             initiatorMap.set(id, event);
         else
             event.initiator = initiatorMap.get(id) || null;
     }
 }