DevTools: beautified styles sidebar toolbar.

third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 94 matching lines @@
      * @return {!Element}
      */
     _createStylesSidebarToolbar: function(ssp)
     {
         var container = createElementWithClass("div", "styles-sidebar-pane-toolbar-container");
         var hbox = container.createChild("div", "hbox styles-sidebar-pane-toolbar");
         var filterContainerElement = hbox.createChild("div", "styles-sidebar-pane-filter-box");
         var filterInput = WebInspector.StylesSidebarPane.createPropertyFilterElement(WebInspector.UIString("Filter"), hbox, ssp.onFilterChanged.bind(ssp));
         filterContainerElement.appendChild(filterInput);
         var toolbar = new WebInspector.ExtensibleToolbar("styles-sidebarpane-toolbar", hbox);
-        toolbar.appendToolbarItem(WebInspector.StylesSidebarPane.createAddNewRuleButton(ssp));
+        toolbar.onLoad().then(() => toolbar.appendToolbarItem(WebInspector.StylesSidebarPane.createAddNewRuleButton(ssp)));
         toolbar.element.classList.add("styles-pane-toolbar");
         toolbar.makeToggledGray();
         var toolbarPaneContainer = container.createChild("div", "styles-sidebar-toolbar-pane-container");
         this._toolbarPaneElement = createElementWithClass("div", "styles-sidebar-toolbar-pane");
         toolbarPaneContainer.appendChild(this._toolbarPaneElement);
         return container;
     },
 
     /**
      * @param {?WebInspector.Widget} widget
@@ skipping 1137 matching lines @@
      */
     wasShown: function()
     {
         this._toolbarItem.setToggled(true);
         this._nodeChanged();
         WebInspector.ThrottledWidget.prototype.wasShown.call(this);
     },
 
     __proto__: WebInspector.ThrottledWidget.prototype
 }