DevTools: Introduce RunMicrotasks event.

third_party/WebKit/Source/devtools/front_end/timeline_model/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 87 matching lines @@
 
     TimeStamp: "TimeStamp",
     ConsoleTime: "ConsoleTime",
     UserTiming: "UserTiming",
 
     ResourceSendRequest: "ResourceSendRequest",
     ResourceReceiveResponse: "ResourceReceiveResponse",
     ResourceReceivedData: "ResourceReceivedData",
     ResourceFinish: "ResourceFinish",
 
+    RunMicrotasks: "RunMicrotasks",
     FunctionCall: "FunctionCall",
     GCEvent: "GCEvent", // For backwards compatibility only, now replaced by MinorGC/MajorGC.
     MajorGC: "MajorGC",
     MinorGC: "MinorGC",
     JSFrame: "JSFrame",
     JSSample: "JSSample",
     // V8Sample events are coming from tracing and contain raw stacks with function addresses.
     // After being processed with help of JitCodeAdded and JitCodeMoved events they
     // get translated into function infos and stored as stacks in JSSample events.
     V8Sample: "V8Sample",
@@ skipping 1660 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;
     }
 }