Add support for client/dartc compilation only tests.

tools/testing/dart/test_options.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("test_options_parser");
 
 List<String> defaultTestSelectors =
     const ['samples', 'standalone', 'corelib', 'co19', 'language',
            'isolate', 'stub-generator', 'vm'];
 
@@ skipping 230 matching lines @@
         selectors = new List.from(defaultTestSelectors);
       }
       Map<String, RegExp> selectorMap = new Map<String, RegExp>();
       for (var i = 0; i < selectors.length; i++) {
         var pattern = selectors[i];
         var suite = pattern;
         var slashLocation = pattern.indexOf('/');
         if (slashLocation != -1) {
           suite = pattern.substring(0, slashLocation);
           pattern = pattern.substring(slashLocation + 1);
+          pattern = pattern.replaceAll('*', '.*');
+          pattern = pattern.replaceAll('/', '.*');
+        } else {
+          pattern = ".*";
         }
-        pattern = pattern.replaceAll('*', '.*');
-        pattern = pattern.replaceAll('/', '.*');
         if (selectorMap.containsKey(suite)) {
           print("Warning: selector '$suite/$pattern' overrides " +
                 "previous selector for suite '$suite'");
         }
         selectorMap[suite] = new RegExp(pattern);
       }
       configuration['selectors'] = selectorMap;
     }
 
     // Expand the architectures.
@@ skipping 101 matching lines @@
       if (option.keys.some((key) => key == name)) {
         return option;
       }
     }
     return null;
   }
 
 
   List<_TestOptionSpecification> _options;
 }