DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/layers/PaintProfilerView.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 220 matching lines @@
             this.sidebarTree.appendChild(node);
         }
     },
 
     /**
      * @param {!Element} target
      * @return {!Element}
      */
     _getHoverAnchor: function(target)
     {
-        return target.enclosingNodeOrSelfWithNodeName("span");
+        return /** @type {!Element} */ (target.enclosingNodeOrSelfWithNodeName("span"));
     },
 
     /**
      * @param {!Element} element
      * @param {function(!WebInspector.RemoteObject, boolean, !Element=):undefined} showCallback
      */
     _resolveObjectForPopover: function(element, showCallback)
     {
         var liElement = element.enclosingNodeOrSelfWithNodeName("li");
         var logItem = liElement.treeElement.representedObject;
@@ skipping 70 matching lines @@
     /**
      * @param {boolean} hovered
      */
     setHovered: function(hovered)
     {
         this.listItemElement.classList.toggle("hovered", hovered);
     },
 
     __proto__: TreeElement.prototype
 };