DevTools: Add new DocumentationURLProvider sources and some tests for documentation

Source/devtools/front_end/documentation/DocumentationURLProvider.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  */
 WebInspector.DocumentationURLProvider = function()
 {
 }
 
 /**
  * @const
  * @type {!Array.<!Object, string>}
  */
 WebInspector.DocumentationURLProvider._sources = [
     { source: window, url: "javascript/" },
     { source: window.Node.prototype, url: "dom/Node/" },
+    { source: window.Node, url: "dom/Node/" },
+    { source: window.Object.prototype, url: "javascript/Object/" },
     { source: window.Object, url: "javascript/Object/" },
     { source: window.Math, url: "javascript/Math/" },
+    { source: window.Array.prototype, url: "javascript/Array/" },
     { source: window.Array, url: "javascript/Array/" },
+    { source: window.String.prototype, url: "javascript/String/" },
     { source: window.String, url: "javascript/String/" },
+    { source: window.Date.prototype, url: "javascript/Date/" },
     { source: window.Date, url: "javascript/Date/" },
     { source: window.JSON, url: "javascript/JSON/" }
 ];
 
 /**
  * @const
  */
 WebInspector.DocumentationURLProvider._urlFormat = "http://docs.webplatform.org/w/api.php?action=query&titles=%s%s&prop=revisions&rvprop=timestamp|content&format=json"
 
 WebInspector.DocumentationURLProvider.prototype = {
     /**
      * @param {string} searchTerm
      * @return {?string}
      */
     itemPath: function(searchTerm)
     {
         for (var i = 0; i < WebInspector.DocumentationURLProvider._sources.length; ++i) {
             var sourceRef = WebInspector.DocumentationURLProvider._sources[i];
             if (sourceRef.source[searchTerm] instanceof Function)
                 return String.sprintf(WebInspector.DocumentationURLProvider._urlFormat, sourceRef.url, searchTerm);
         }
         return null;
     }
 }