Issue: Angular 2 should provide a way to tell when the list of pending tasks for a turn is 0.

First step:

Inject a JS script after calling the main method in JS / including the main script in Dart that allows protractor to call this in the browser (see https://github.com/angular/protractor/blob/master/lib/clientsidescripts.js#L37)

angular.getTestability(el).whenStable(callback);