search: propagate GAppInfo to SearchProvider

Save the GAppInfo in the provider object; this will be used when
filtering.

https://bugzilla.gnome.org/show_bug.cgi?id=687491

js/ui/search.js

@@ -74,8 +74,9 @@ const SearchResultDisplay = new Lang.Class({
 const SearchProvider = new Lang.Class({
     Name: 'SearchProvider',
 
-    _init: function(title) {
+    _init: function(title, appInfo) {
         this.title = title;
+        this.appInfo = appInfo;
         this.searchSystem = null;
     },