Fix up dromaeo after lib v2 merge and add Dromaeo smoketest to prevent future

samples/third_party/dromaeo/Dromaeo.dart

+library dromaeo_test;
+
 import 'dart:html';
 import 'dart:json' as json;
 import 'dart:math' as Math;
 import 'Suites.dart';
 
 main() {
   new Dromaeo().run();
 }
 
 class SuiteController {
@@ skipping 80 matching lines @@
   Dromaeo()
       : _suiteControllers = new List<SuiteController>()
   {
     _handler = _createHandler();
     window.onMessage.listen(
         (MessageEvent event) {
           try {
             final response = json.parse(event.data);
             _handler = _handler(response['command'], response['data']);
           } catch (e, stacktrace) {
-            window.alert('Exception: ${e}: ${stacktrace}');
+            if (!(e is FormatException &&
+                (event.data.toString().startsWith('unittest') ||
+                event.data.toString().startsWith('dart')))) {
+              // Hack because unittest also uses post messages to communicate.
+              // So the fact that the event.data is not proper json is not
+              // always an error.
+              print('Exception: ${e}: ${stacktrace}');
+              print(event.data);
+            }
           }
         });
   }
 
   run() {
     // TODO(vsm): Initial page should not run.  For now, run all
     // tests by default.
-    final splitUrl = window.location.href.split('?');
-    var tags;
-    if (splitUrl.length > 1) {
-      tags = splitUrl[1];
+    var tags = window.location.search;
+    if (tags.length > 1) {
+      tags = tags.substring(1);
     } else if (window.navigator.userAgent.contains('(Dart)')) {
       // TODO(vsm): Update when we change Dart VM detection.
       tags = 'js|dart&html';
     } else {
       tags = 'js|dart2js&html';
     }
 
     // TODO(antonm): create Re-run tests href.
     final Element suiteNameElement = _byId('overview').nodes[0];
     final category = Suites.getCategory(tags);
@@ skipping 88 matching lines @@
   }
 
   Element _byId(String id) {
     return document.query('#$id');
   }
 
   int get _suitesTotal {
     return _suiteControllers.length;
   }
 }