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

samples/third_party/dromaeo/tests/dom-modify-htmlidiomatic.dart

-library dromaeo;
-import 'dart:html';
-import 'dart:json' as json;
-import 'dart:math' as Math;
-part 'Common.dart';
-part 'RunnerSuite.dart';
-
-void main() {
-  final int num = 400;
-
-  String str = 'null';
-  // Very ugly way to build up the string, but let's mimic JS version as much as possible.
-  for (int i = 0; i < 1024; i++) {
-    str = "$str${new String.fromCharCodes([((25 * Math.random()) + 97).toInt()])}";
-  }
-
-  List<Node> elems = <Node>[];
-
-  // Try to force real results.
-  var ret;
-
-  final htmlstr = document.body.innerHtml;
-
-  new Suite(window, 'dom-modify')
-    .test('createElement', () {
-      for (int i = 0; i < num; i++) {
-        ret = new Element.tag('div');
-        ret = new Element.tag('span');
-        ret = new Element.tag('table');
-        ret = new Element.tag('tr');
-        ret = new Element.tag('select');
-      }
-    })
-    .test('createTextNode', () {
-      for (int i = 0; i < num; i++) {
-        ret = new Text(str);
-        ret = new Text('${str}2');
-        ret = new Text('${str}3');
-        ret = new Text('${str}4');
-        ret = new Text('${str}5');
-      }
-    })
-    .test('innerHtml', () {
-      document.body.innerHtml = htmlstr;
-    })
-    .prep(() {
-      elems = new List<Node>();
-      final telems = document.body.nodes;
-      for (int i = 0; i < telems.length; i++) {
-        elems.add(telems[i]);
-      }
-    })
-    .test('cloneNode', () {
-      for (int i = 0; i < elems.length; i++) {
-        ret = elems[i].clone(false);
-        ret = elems[i].clone(true);
-        ret = elems[i].clone(true);
-        }
-    })
-    .test('appendChild', () {
-      for (int i = 0; i < elems.length; i++)
-        document.body.nodes.add(elems[i]);
-    })
-    .test('insertBefore', () {
-      for (int i = 0; i < elems.length; i++)
-        document.body.insertBefore(elems[i], document.body.nodes.first);
-    })
-    .end();
-}