Add a support for a slow marker in status files.

tools/testing/dart/status_file_parser.dart

 // Copyright (c) 2012, 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.
 
 #library("status_file_parser");
 
 #import("dart:io");
 #import("status_expression.dart");
 
-// Possible outcomes of running a test.
+/** Possible outcomes of running a test. */
 final CRASH = "crash";
 final TIMEOUT = "timeout";
 final FAIL = "fail";
 final PASS = "pass";
-// An indication to skip the test.  The caller is responsible for skipping it.
+/**
+ * An indication to skip the test.  The caller is responsible for skipping it.
+ */
 final SKIP = "skip";
 final OK = "ok";
+/**
+ * An indication that a test is slow and we should allow extra time for
+ * completion.
+ */
+final SLOW = "slow";
 
 final RegExp StripComment = const RegExp("^[^#]*");
 final RegExp HeaderPattern = const RegExp(@"^\[([^\]]+)\]");
 final RegExp RulePattern = const RegExp(@"\s*([^: ]*)\s*:(.*)");
 
 // TODO(whesse): Implement configuration_info library that contains data
 // structures for test configuration, including Section.
 class Section {
   BooleanExpression condition;
   List<TestRule> testRules;
@@ skipping 169 matching lines @@
         }
         regExps[i] = regExp;
       }
       _keyToRegExps[key] = regExps;
     });
 
     _regExpCache = null;
     _preprocessed = true;
   }
 }