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

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

-library dromaeo;
-import 'dart:html';
-import '../common/common.dart';
-import 'dart:math' as Math;
-part 'Common.dart';
-part 'RunnerSuite.dart';
-
-void main() {
-  final int num = 40;
-
-  // Try to force real results.
-  var ret;
-
-  String html = document.body.innerHtml;
-
-  new Suite(window, 'dom-traverse')
-    .prep(() {
-      html = BenchUtil.replaceAll(html, 'id="test(\\w).*?"', (Match match) {
-        final group = match.group(1);
-        return 'id="test${group}${num}"';
-      });
-      html = BenchUtil.replaceAll(html, 'name="test.*?"', (Match match) {
-        return 'name="test${num}"';
-      });
-      html = BenchUtil.replaceAll(html, 'class="foo.*?"', (Match match) {
-        return 'class="foo test${num} bar"';
-      });
-
-      final div = new Element.tag('div');
-      div.innerHtml = html;
-      document.body.nodes.add(div);
-    })
-    .test('firstChild', () {
-      final nodes = document.body.nodes;
-      final nl = nodes.length;
-
-      for (int i = 0; i < num; i++) {
-        for (int j = 0; j < nl; j++) {
-          Node cur = nodes[j];
-          while (cur != null) {
-            cur = cur.nodes.first;
-          }
-          ret = cur;
-        }
-      }
-    })
-    .test('lastChild', () {
-      final nodes = document.body.nodes;
-      final nl = nodes.length;
-
-      for (int i = 0; i < num; i++) {
-        for (int j = 0; j < nl; j++) {
-          Node cur = nodes[j];
-          while (cur != null) {
-            cur = cur.nodes.last;
-          }
-          ret = cur;
-        }
-      }
-    })
-    .test('nextSibling', () {
-      for (int i = 0; i < num * 2; i++) {
-        Node cur = document.body.nodes.first;
-        while (cur != null) {
-          cur = cur.nextNode;
-        }
-        ret = cur;
-      }
-    })
-    .test('previousSibling', () {
-      for (int i = 0; i < num * 2; i++) {
-        Node cur = document.body.nodes.last;
-        while (cur != null) {
-          cur = cur.previousNode;
-        }
-        ret = cur;
-      }
-    })
-    .test('childNodes', () {
-      for (int i = 0; i < num; i++) {
-        final nodes = document.body.nodes;
-        for (int j = 0; j < nodes.length; j++) {
-          ret = nodes[j];
-        }
-      }
-    })
-    .end();
-}