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

samples/third_party/dromaeo/Suites.dart

 library Suites;
 
 class Origin {
   final String author;
   final String url;
 
   const Origin(this.author, this.url);
 }
 
 class SuiteDescription {
@@ skipping 54 matching lines @@
           'Querying DOM elements in a document',
           const ['query'],
           _CORE_TEST_OPTIONS),
       const SuiteDescription(
           'dom-traverse.html',
           'DOM Traversal',
           JOHN_RESIG,
           'Traversing a DOM structure',
           const ['traverse'],
           _CORE_TEST_OPTIONS),
+      const SuiteDescription(
+          '../../../../../tests/html/dromaeo_smoke.html',
+          'Smoke test',
+          const Origin('', ''),
+          'Dromaeo no-op smoke test',
+          const ['nothing'],
+          _CORE_TEST_OPTIONS),
   ];
 
   // Mappings from original path to actual path given platform/library.
   static _getHtmlPathForVariant(platform, lib, path) {
     if (lib != '') {
       lib = '-$lib';
     }
     switch (platform) {
       case 'js':
       case 'dart':
@@ skipping 73 matching lines @@
       return CATEGORIES[tags];
     }
     for (final suite in _CORE_SUITE_DESCRIPTIONS) {
       if (suite.tags[0] == tags) {
         return suite.name;
       }
     }
     return null;
   }
 }