DevTools: add a navigator menu with grouping options.

third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js

 /*
  * Copyright (C) 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 116 matching lines @@
         if (!item.checked)
             checkMarkElement.style.opacity = "0";
 
         if (item.element) {
             var wrapper = menuItemElement.createChild("div", "soft-context-menu-custom-item");
             wrapper.appendChild(item.element);
             menuItemElement._isCustom = true;
             return menuItemElement;
         }
 
+        if (!item.enabled)
+            menuItemElement.classList.add("soft-context-menu-disabled");
         menuItemElement.createTextChild(item.label);
         menuItemElement.createChild("span", "soft-context-menu-shortcut").textContent = item.shortcut;
 
         menuItemElement.addEventListener("mousedown", this._menuItemMouseDown.bind(this), false);
         menuItemElement.addEventListener("mouseup", this._menuItemMouseUp.bind(this), false);
 
         // Manually manage hover highlight since :hover does not work in case of click-and-hold menu invocation.
         menuItemElement.addEventListener("mouseover", this._menuItemMouseOver.bind(this), false);
         menuItemElement.addEventListener("mouseleave", this._menuItemMouseLeave.bind(this), false);
 
@@ skipping 240 matching lines @@
 
     _discardSubMenus: function()
     {
         if (this._subMenu)
             this._subMenu._discardSubMenus();
         this.element.remove();
         if (this._parentMenu)
             delete this._parentMenu._subMenu;
     }
 }