Move dromaeo to third_party

samples/third_party/dromaeo/Dromaeo.dart

 #import('dart:dom');
 #import('dart:json');
 #import('Suites.dart');
 
 main() {
   new Dromaeo().run();
 }
 
 class SuiteController {
   final SuiteDescription _suiteDescription;
@@ skipping 186 matching lines @@
   }
 
   HTMLElement _byId(String id) {
     return document.getElementById(id);
   }
 
   int get _suitesTotal() {
     return _suiteControllers.length;
   }
 }