Get Dromaeo benchmarks running again.

samples/third_party/dromaeo/Dromaeo.dart

 #import('dart:html');
 #import('dart:json');
 #import('Suites.dart');
 
 main() {
   new Dromaeo().run();
 }
 
 class SuiteController {
   final SuiteDescription _suiteDescription;
@@ skipping 14 matching lines @@
     _suiteIframe.contentWindow.postMessage('start', '*');
   }
 
   update(String testName, num mean, num error, double percent) {
     _meanProduct *= mean;
     _nTests++;
 
     final meanAsString = mean.toStringAsFixed(2);
     final errorAsString = error.toStringAsFixed(2);
     final Element progressDisplay = _element.nextNode.nextNode;
-    progressDisplay.innerHTML +=
-        '<li><b>${testName}:</b>' +
+    progressDisplay.innerHTML =
+        '${progressDisplay.innerHTML}<li><b>${testName}:</b>'
         '${meanAsString}<small> runs/s &#177;${errorAsString}%<small></li>';
     _updateTestPos(percent);
   }
 
   _make() {
     _element = _createDiv('test');
     // TODO(antonm): add an onclick functionality.
     _updateTestPos();
   }
 
   _updateTestPos([double percent = 1.0]) {
     String suiteName = _suiteDescription.name;
     final done = percent >= 100.0;
     String info = '';
     if (done) {
       final parent = _element.parent;
       parent.attributes['class'] = '${parent.attributes["class"]} done';
       final mean = Math.pow(_meanProduct, 1.0 / _nTests).toStringAsFixed(2);
       info = '<span>${mean} runs/s</span>';
     }
     _element.innerHTML =
-        '<b>${suiteName}:</b>' +
+        '<b>${suiteName}:</b>' 
         '<div class="bar"><div style="width:${percent}%;">${info}</div></div>';
   }
 
   _init() {
     final div = _createDiv('result-item');
     div.nodes.add(_element);
     final description = _suiteDescription.description;
     final originUrl = _suiteDescription.origin.url;
     final testUrl = 'tests/${_suiteDescription.file}';
-    div.innerHTML +=
-        '<p>${description}<br/><a href="${originUrl}">Origin</a>' +
-        ', <a href="${testUrl}">Source</a>' +
+    div.innerHTML =
+        '${div.innerHTML}<p>${description}<br/><a href="${originUrl}">Origin</a'
+        '>, <a href="${testUrl}">Source</a>'
         '<ol class="results"></ol>';
     // Reread the element, as the previous wrapper get disconnected thanks
     // to .innerHTML update above.
     _element = div.nodes[0];
 
     document.query('#main').nodes.add(div);
   }
 
   DivElement _createDiv(String clazz) {
     final div = new DivElement();
@@ skipping 131 matching lines @@
   }
 
   Element _byId(String id) {
     return document.query('#$id');
   }
 
   int get _suitesTotal() {
     return _suiteControllers.length;
   }
 }