DevTools: Change default timeline overview mode to events.

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 53 matching lines @@
     this._durationFilter = new WebInspector.TimelineIsLongFilter();
     this._textFilter = new WebInspector.TimelineTextFilter();
     this._model.addFilter(this._categoryFilter);
     this._model.addFilter(this._durationFilter);
     this._model.addFilter(this._textFilter);
     this._model.addFilter(new WebInspector.TimelineStaticFilter());
 
     /** @type {!Array.<!WebInspector.TimelineModeView>} */
     this._currentViews = [];
 
-    this._overviewModeSetting = WebInspector.settings.createSetting("timelineOverviewMode", WebInspector.TimelinePanel.OverviewMode.Frames);
+    this._overviewModeSetting = WebInspector.settings.createSetting("timelineOverviewMode", WebInspector.TimelinePanel.OverviewMode.Events);
     this._flameChartEnabledSetting = WebInspector.settings.createSetting("timelineFlameChartEnabled", true);
     this._createToolbarItems();
 
     var topPaneElement = this.element.createChild("div", "hbox");
     topPaneElement.id = "timeline-overview-panel";
 
     // Create top overview component.
     this._overviewPane = new WebInspector.TimelineOverviewPane("timeline");
     this._overviewPane.addEventListener(WebInspector.TimelineOverviewPane.Events.WindowChanged, this._onWindowChanged.bind(this));
     this._overviewPane.show(topPaneElement);
@@ skipping 1750 matching lines @@
     /**
      * @override
      */
     reset: function()
     {
         this._filmStripView.reset();
     },
 
     __proto__: WebInspector.TimelineOverviewBase.prototype
 }