Use boolean selector syntax for tags.

lib/src/runner/configuration/load.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:io';
 
+import 'package:boolean_selector/boolean_selector.dart';
 import 'package:glob/glob.dart';
 import 'package:path/path.dart' as p;
 import 'package:source_span/source_span.dart';
 import 'package:yaml/yaml.dart';
 
 import '../../backend/test_platform.dart';
 import '../../frontend/timeout.dart';
 import '../../utils.dart';
 import '../configuration.dart';
 import 'values.dart';
@@ skipping 45 matching lines @@
 
     var addTags = _getList("add_tags", (tagNode) {
       _validate(tagNode, "Tags must be strings.", (value) => value is String);
       _validate(
           tagNode,
           "Invalid tag. Tags must be (optionally hyphenated) Dart identifiers.",
           (value) => value.contains(anchoredHyphenatedIdentifier));
       return tagNode.value;
     });
 
-    var tags = _getMap("tags", key: (keyNode) {
-      _validate(keyNode, "tags key must be a string.",
-          (value) => value is String);
-      _validate(
-          keyNode,
-          "Invalid tag. Tags must be (optionally hyphenated) Dart identifiers.",
-          (value) => value.contains(anchoredHyphenatedIdentifier));
-
-      return keyNode.value;
-    }, value: (valueNode) {
-      return _nestedConfig(valueNode, "tag value", runnerConfig: false);
-    });
+    var tags = _getMap("tags",
+        key: (keyNode) => _parseNode(keyNode, "tags key",
+            (value) => new BooleanSelector.parse(value)),
+        value: (valueNode) =>
+            _nestedConfig(valueNode, "tag value", runnerConfig: false));
 
     return new Configuration(
         verboseTrace: verboseTrace,
         jsTrace: jsTrace,
         timeout: timeout,
         addTags: addTags,
         tags: tags);
   }
 
   /// Loads runner configuration (but not test configuration).
@@ skipping 173 matching lines @@
     if (!_document.containsKey(field)) return;
     _error("$field isn't supported here.", field);
   }
 
   /// Throws a [SourceSpanFormatException] with [message] about [field].
   void _error(String message, String field) {
     throw new SourceSpanFormatException(
         message, _document.nodes[field].span, _source);
   }
 }