DevTools: better visual feedback for hovered objects is Layers3DView

Source/devtools/front_end/timeline/LayerTreeOutline.js

 /*
  * Copyright (C) 2013 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 122 matching lines @@
     },
 
     /**
      * @param {!Event} event
      */
     _onMouseMove: function(event)
     {
         var node = this._treeOutline.treeElementFromEvent(event);
         if (node === this._lastHoveredNode)
             return;
-        this.dispatchEventToListeners(WebInspector.LayerTreeOutline.Events.LayerHovered, node && node.representedObject ? {layer: node.representedObject} : null);
+        var selection = node && node.representedObject ? new WebInspector.Layers3DView.LayerSelection(node.representedObject) : null;
+        this.dispatchEventToListeners(WebInspector.LayerTreeOutline.Events.LayerHovered, selection);
     },
 
     /**
      * @param {!WebInspector.LayerTreeElement} node
      */
     _selectedNodeChanged: function(node)
     {
         var layer = /** @type {!WebInspector.Layer} */ (node.representedObject);
-        this.dispatchEventToListeners(WebInspector.LayerTreeOutline.Events.LayerSelected, {layer: layer});
+        var selection = node.representedObject ? new WebInspector.Layers3DView.LayerSelection(node.representedObject) : null;
+        this.dispatchEventToListeners(WebInspector.LayerTreeOutline.Events.LayerSelected, selection);
     },
 
     /**
      * @param {!Event} event
      */
     _onContextMenu: function(event)
     {
         var node = this._treeOutline.treeElementFromEvent(event);
         if (!node || !node.representedObject)
             return;
@@ skipping 57 matching lines @@
     /**
      * @param {boolean} hovered
      */
     setHovered: function(hovered)
     {
         this.listItemElement.classList.toggle("hovered", hovered);
     },
 
     __proto__: TreeElement.prototype
 }