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 13 matching lines @@
 
   static const CATEGORIES = const {
     // Platform tags
     'js': 'DOM Core Tests (JavaScript)',
     'dart': 'DOM Core Tests (dart)',
     'frog': 'DOM Core Tests (frog)',
     'dart2js': 'DOM Core Tests (dart2js)',
 
     // Library tags
     'html': 'DOM Core Tests (dart:html)',
-    'htmlidiomatic': 'DOM Core Tests (dart:html) Idiomatic',
   };
 
   static const _CORE_TEST_OPTIONS = const [
       // A list of valid combinations for core Dromaeo DOM tests.
       // Each item in the list is a pair of (platform x [variants]).
       const ['js', const ['']],
-      const ['dart', const ['html', 'htmlidiomatic']],
-      const ['frog', const ['html', 'htmlidiomatic']],
-      const ['dart2js', const ['html', 'htmlidiomatic']],
+      const ['dart', const ['html']],
+      const ['frog', const ['html']],
+      const ['dart2js', const ['html']],
     ];
 
   static const _CORE_SUITE_DESCRIPTIONS = const [
       const SuiteDescription(
           'dom-attr.html',
           'DOM Attributes',
           JOHN_RESIG,
           'Setting and getting DOM node attributes',
           const ['attributes'],
           _CORE_TEST_OPTIONS),
@@ skipping 11 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;
   }
 }