DevTools: Implement undo, redo operations for the DOMStorage views.

Source/devtools/front_end/DOMStorageItemsView.js

 /*
  * Copyright (C) 2008 Nokia Inc.  All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. 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
@@ skipping 50 matching lines @@
     {
         this._update();
     },
 
     willHide: function()
     {
         this.deleteButton.visible = false;
     },
 
     /**
+     * @param {KeyboardEvent} event
+     */
+    handleShortcut: function(event)
+    {
+        if (WebInspector.KeyboardShortcut.eventHasCtrlOrMeta(event) && !event.shiftKey && event.keyIdentifier === "U+005A") { // Z key
+            this.domStorage.undo();
+            event.handled = true;
+            return;
+        }
+
+        var isRedoKey = WebInspector.isMac() ? event.metaKey && event.shiftKey && event.keyIdentifier === "U+005A" : // Z key
+                                               event.ctrlKey && event.keyIdentifier === "U+0059"; // Y key
+        if (isRedoKey) {
+            this.domStorage.redo();
+            event.handled = true;
+            return;
+        }
+    },
+
+    /**
      * @param {WebInspector.Event} event
      */
     _domStorageItemsCleared: function(event)
     {
         if (!this.isShowing() || !this._dataGrid)
             return;
 
         this._dataGrid.rootNode().removeChildren();
         this._dataGrid.addCreationNode(false);
         this.deleteButton.visible = false;
@@ skipping 172 matching lines @@
     {
         if (!node || node.isCreationNode)
             return;
 
         if (this.domStorage)
             this.domStorage.removeItem(node.data.key);
     },
 
     __proto__: WebInspector.View.prototype
 }