DevTools: [Documentation] Add signature section for renderer

Source/devtools/front_end/documentation/DocumentationURLProvider.js

Index: Source/devtools/front_end/documentation/DocumentationURLProvider.js
diff --git a/Source/devtools/front_end/documentation/DocumentationURLProvider.js b/Source/devtools/front_end/documentation/DocumentationURLProvider.js
index 239ea445e388ed7b245d6e2036919b4bffda8393..6dff0038edcbfe0689a3303d19438c89d0f86b68 100644
--- a/Source/devtools/front_end/documentation/DocumentationURLProvider.js
+++ b/Source/devtools/front_end/documentation/DocumentationURLProvider.js
@@ -162,8 +162,10 @@ WebInspector.DocumentationURLProvider.prototype = {
      */
     itemDescriptors: function(searchTerm)
     {
-        if (this._state === WebInspector.DocumentationURLProvider.DownloadStates.Finished)
-            return this._articleList.get(searchTerm) || [];
+        if (this._state === WebInspector.DocumentationURLProvider.DownloadStates.Finished) {
+            if (searchTerm.toUpperCase() !== searchTerm)
+                return this._articleList.get(searchTerm) || [];
+        }
         // If download of available articles list is not finished yet, use approximate method.
         if (this._state === WebInspector.DocumentationURLProvider.DownloadStates.NotStarted)
             this._loadArticleList();
@@ -172,7 +174,7 @@ WebInspector.DocumentationURLProvider.prototype = {
         var sources = WebInspector.DocumentationURLProvider._sources;
         var propertyName = searchTerm.toUpperCase() === searchTerm ? "constants" : searchTerm;
         for (var i = 0; i < sources.length; ++i) {
-            if (!sources[i].source().hasOwnProperty(propertyName))
+            if (!sources[i].source().hasOwnProperty(searchTerm) || this._inheritedFromFunction(sources[i].source(), searchTerm))
                 continue;
             descriptors.push(new WebInspector.DocumentationURLProvider.ItemDescriptor(sources[i], propertyName));
         }
@@ -240,11 +242,22 @@ WebInspector.DocumentationURLProvider.prototype = {
         var propertyName = itemPath.substring(lastSlashIndex + 1).replace(" ", "_");
         var sources = WebInspector.DocumentationURLProvider._sources;
         for (var i = 0; i < sources.length; ++i) {
-            if (sources[i].url() !== sourceName || !sources[i].source().hasOwnProperty(propertyName))
+            if (sources[i].url() !== sourceName || !sources[i].source().hasOwnProperty(propertyName) || this._inheritedFromFunction(sources[i].source(), propertyName))
                 continue;
             var descriptors = this._articleList.get(propertyName) || [];
             descriptors.push(new WebInspector.DocumentationURLProvider.ItemDescriptor(sources[i], propertyName));
             this._articleList.set(propertyName, descriptors);
         }
+    },
+
+    /**
+     * FIXME: object parameter is not annotated property due to crbug.com/407097
+     * @param {*} object
+     * @param {string} propertyName
+     * @return {boolean}
+     */
+    _inheritedFromFunction: function(object, propertyName)
+    {
+        return (object instanceof Function && object.hasOwnProperty(propertyName) && Function.hasOwnProperty(propertyName));
     }
 }