Devtools UI: Add node-specific actions into a ghost toolbar in DOM

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 75 matching lines @@
 
 /** @typedef {{node: !WebInspector.DOMNode, isCut: boolean}} */
 WebInspector.ElementsTreeOutline.ClipboardData;
 
 /**
  * @enum {string}
  */
 WebInspector.ElementsTreeOutline.Events = {
     NodePicked: "NodePicked",
     SelectedNodeChanged: "SelectedNodeChanged",
-    ElementsTreeUpdated: "ElementsTreeUpdated"
+    ElementsTreeUpdated: "ElementsTreeUpdated",
+    DecorationsClicked: "DecorationsClicked"
 }
 
 /**
  * @const
  * @type {!Object.<string, string>}
  */
 WebInspector.ElementsTreeOutline.MappedCharToEntity = {
     "\u00a0": "nbsp",
     "\u0093": "#147", // <control>
     "\u00ad": "shy",
@@ skipping 1715 matching lines @@
             if (node) {
                 this.treeOutline._selectedDOMNode = node;
                 this.treeOutline._selectedNodeChanged();
             }
         }
         return true;
     },
 
     __proto__: TreeElement.prototype
 }