DevTools: [Elements] Implement shortcut-based node cut-copy-pasting

Source/devtools/front_end/elements/ElementsTreeOutline.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 332 matching lines @@
 
     /**
      * @param {?WebInspector.DOMNode} node
      * @param {boolean} omitFocus
      */
     _revealAndSelectNode: function(node, omitFocus)
     {
         if (this._suppressRevealAndSelect)
             return;
 
+        this._updateModifiedNodes();
+
         if (!this._includeRootDOMNode && node === this.rootDOMNode && this.rootDOMNode)
             node = this.rootDOMNode.firstChild;
         if (!node)
             return;
         var treeElement = this.createTreeElementFor(node);
         if (!treeElement)
             return;
 
         treeElement.revealAndSelect(omitFocus);
     },
@@ skipping 550 matching lines @@
         // Preserve the semantic of node by following the order of updates for hide and show.
         if (show) {
             for (var i = 0, size = this._highlightResult.length; i < size; ++i)
                 updateEntryShow(this._highlightResult[i]);
         } else {
             for (var i = (this._highlightResult.length - 1); i >= 0; --i)
                 updateEntryHide(this._highlightResult[i]);
         }
     },
 
+    /**
+     * @param {boolean} inClipboard
+     */
+    setInClipboard: function(inClipboard)
+    {
+        if (this._inClipboard === inClipboard)
+            return;
+        this._inClipboard = inClipboard;
+        this.listItemElement.classList.toggle("in-clipboard", inClipboard);
+    },
+
     get hovered()
     {
         return this._hovered;
     },
 
     set hovered(x)
     {
         if (this._hovered === x)
             return;
 
@@ skipping 1738 matching lines @@
         var treeOutline = new WebInspector.ElementsTreeOutline(node.target(), false, false);
         treeOutline.rootDOMNode = node;
         treeOutline.element.classList.add("outline-disclosure");
         if (!treeOutline.children[0].hasChildren)
             treeOutline.element.classList.add("single-node");
         treeOutline.setVisible(true);
         treeOutline.element.treeElementForTest = treeOutline.children[0];
         return treeOutline.element;
     }
 }