DevTools: remove most convenience wrappers from WI.TimelineModel.Record

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 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 859 matching lines @@
         if (this._statusDialog) {
             this._statusDialog.hide();
             delete this._statusDialog;
         }
     },
 
     _setMarkers: function()
     {
         var markers = new Map();
         var recordTypes = WebInspector.TimelineModel.RecordType;
+        var zeroTime = this._model.minimumRecordTime();
         for (var record of this._model.eventDividerRecords()) {
             if (record.type() === recordTypes.TimeStamp || record.type() === recordTypes.ConsoleTime)
                 continue;
-            markers.set(record.startTime(), WebInspector.TimelineUIUtils.createDividerForRecord(record, 0));
+            markers.set(record.startTime(), WebInspector.TimelineUIUtils.createDividerForRecord(record, zeroTime, 0));
         }
         this._overviewPane.setMarkers(markers);
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _willReloadPage: function(event)
     {
         if (this._operationInProgress || this._recordingInProgress() || !this.isShowing())
@@ skipping 1029 matching lines @@
      * @override
      * @param {!WebInspector.Context} context
      * @param {string} actionId
      */
     handleAction: function(context, actionId)
     {
         var panel = WebInspector.context.flavor(WebInspector.TimelinePanel);
         console.assert(panel && panel instanceof WebInspector.TimelinePanel);
         panel._toggleTimelineButtonClicked();
     }
-}
+}