make asyncMethod return the setTimeout handle

src/g-component.html

@@ -379,7 +379,7 @@ license that can be found in the LICENSE file.
       // asyncMethod impl
       
       var asyncMethod = function(inMethod, inArgs, inTimeout) {
-        window.setTimeout(function() {
+        return window.setTimeout(function() {
           this[inMethod].apply(this, inArgs);
         }.bind(this), inTimeout || 0);
       };