Add an option to run skipped tests.

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:collection/collection.dart';
 import 'package:glob/glob.dart';
 import 'package:path/path.dart' as p;
@@ skipping 151 matching lines @@
       _disallow("reporter");
       _disallow("concurrency");
       _disallow("names");
       _disallow("plain_names");
       _disallow("platforms");
       _disallow("add_presets");
       return Configuration.empty;
     }
 
     var pauseAfterLoad = _getBool("pause_after_load");
+    var runSkipped = _getBool("run_skipped");
 
     var reporter = _getString("reporter");
     if (reporter != null && !allReporters.contains(reporter)) {
       _error('Unknown reporter "$reporter".', "reporter");
     }
 
     var concurrency = _getInt("concurrency");
 
     var allPlatformIdentifiers =
         TestPlatform.all.map((platform) => platform.identifier).toSet();
     var platforms = _getList("platforms", (platformNode) {
       _validate(platformNode, "Platforms must be strings.",
           (value) => value is String);
       _validate(platformNode, 'Unknown platform "${platformNode.value}".',
           allPlatformIdentifiers.contains);
 
       return TestPlatform.find(platformNode.value);
     });
 
     var chosenPresets = _getList("add_presets",
         (presetNode) => _parseIdentifierLike(presetNode, "Preset name"));
 
     return new Configuration(
         pauseAfterLoad: pauseAfterLoad,
+        runSkipped: runSkipped,
         reporter: reporter,
         concurrency: concurrency,
         platforms: platforms,
         chosenPresets: chosenPresets);
   }
 
   /// Loads runner configuration that's not allowed in the global configuration
   /// file.
   ///
   /// If [_runnerConfig] is `false` or if [_global] is `true`, this will error
@@ skipping 189 matching lines @@
         _document.nodes.keys.firstWhere((key) => key.value == field).span,
         _source);
   }
 
   /// Throws a [SourceSpanFormatException] with [message] about [field].
   void _error(String message, String field) {
     throw new SourceSpanFormatException(
         message, _document.nodes[field].span, _source);
   }
 }