Allow varying case in the expected outcome (Pass, PASS).

tools/testing/dart/status_expression.dart

 // Copyright (c) 2011, 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_expression");
 
 /**
  * Parse and evaluate expressions in a .status file for Dart and V8.
  * There are set expressions and Boolean expressions in a .status file.
  * The grammar is:
@@ skipping 144 matching lines @@
 
   Set<String> evaluate(environment) => right.evaluate(environment) ?
     left.evaluate(environment) : new Set<String>();
   String toString() => "($left if $right)";
 }
     
 
 class SetConstant implements SetExpression {
   String value;
 
-  SetConstant(this.value);
+  SetConstant(String v) : value = v.toLowerCase();
 
   Set<String> evaluate(environment) => new Set<String>.from([value]);
   String toString() => value;
 }
 
 
 // An iterator that allows peeking at the current token.
 class Scanner {
   List<String> tokens;
   Iterator tokenIterator;
@@ skipping 113 matching lines @@
           "Expected identifier in expression, got ${scanner.current}");
       TermConstant right = new TermConstant(scanner.current);
       scanner.advance();
       return new Comparison(left, right);
     } else {
       return new BooleanVariable(left);
     } 
   }
 }