DevTools: introduce persistence/ module

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

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 76 matching lines @@
 
     /**
      * @return {!Array.<string>}
      */
     tabIds: function()
     {
         return this._tabs.map(tab => tab._id);
     },
 
     /**
+     * @param {string} tabId
+     * @return {number}
+     */
+    tabIndex: function(tabId)
+    {
+        return this._tabs.findIndex(tab => tab.id === tabId);
+    },
+
+    /**
      * @return {!Array.<!WebInspector.Widget>}
      */
     tabViews: function()
     {
         return this._tabs.map(tab => tab.view);
     },
 
     /**
      * @param {string} tabId
      * @return {?WebInspector.Widget}
@@ skipping 1144 matching lines @@
      * @param {!Array.<string>} ids
      */
     closeTabs: function(tabbedPane, ids) { },
 
     /**
      * @param {string} tabId
      * @param {!WebInspector.ContextMenu} contextMenu
      */
     onContextMenu: function(tabId, contextMenu) { }
 }