Merge to 2883 "[DevTools] Support top/bottom show sidebar button."

third_party/WebKit/Source/devtools/front_end/ui/SplitWidget.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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 869 matching lines @@
     {
         this._forceUpdateLayout();
     },
 
     /**
      * @param {string} title
      * @return {!WebInspector.ToolbarButton}
      */
     createShowHideSidebarButton: function(title)
     {
-        console.assert(this.isVertical(), "Buttons for split widget with horizontal split are not supported yet.");
-
         this._showHideSidebarButtonTitle = WebInspector.UIString(title);
         this._showHideSidebarButton = new WebInspector.ToolbarButton("", "sidebar-toolbar-item");
         this._showHideSidebarButton.addEventListener("click", buttonClicked.bind(this));
         this._updateShowHideSidebarButton();
 
         /**
          * @param {!WebInspector.Event} event
          * @this {WebInspector.SplitWidget}
          */
         function buttonClicked(event)
         {
             if (this._showMode !== WebInspector.SplitWidget.ShowMode.Both)
                 this.showBoth(true);
             else
                 this.hideSidebar(true);
         }
 
         return this._showHideSidebarButton;
     },
 
     _updateShowHideSidebarButton: function()
     {
         if (!this._showHideSidebarButton)
             return;
         var sidebarHidden = this._showMode === WebInspector.SplitWidget.ShowMode.OnlyMain;
-        this._showHideSidebarButton.setState((this.isSidebarSecond() ? "right" : "left") + "-" + (sidebarHidden ? "show" : "hide"));
+        var side = this.isVertical() ? (this.isSidebarSecond() ? "right" : "left") : (this.isSidebarSecond() ? "bottom" : "top");
+        this._showHideSidebarButton.setState(side + "-" + (sidebarHidden ? "show" : "hide"));
         this._showHideSidebarButton.setTitle(sidebarHidden ? WebInspector.UIString("Show %s", this._showHideSidebarButtonTitle) : WebInspector.UIString("Hide %s", this._showHideSidebarButtonTitle));
     },
 
     __proto__: WebInspector.Widget.prototype
 }