Fix multitest display name bug in test scripts.

tools/testing/dart/test_suite.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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 819 matching lines @@
       if (existsCache.doesFileExist(pubspecYamlPath.toNativePath())) {
         return root.join(pubspecYamlPath);
       }
       segments.removeLast();
     }
     return null;
   }
 
   void enqueueTestCaseFromTestInformation(TestInformation info) {
     String testName = buildTestCaseDisplayName(suiteDir, info.originTestPath,
-        multitestName: info.multitestKey);
+        multitestName:
+          info.optionsFromFile['isMultitest'] ? info.multitestKey : "");
     Set<Expectation> expectations = testExpectations.expectations(testName);
     if (info is HtmlTestInformation) {
       if (TestUtils.isBrowserRuntime(configuration['runtime'])) {
         enqueueBrowserTest([], null, info, testName, expectations);
       }
       return;
     }
     var filePath = info.filePath;
     var optionsFromFile = info.optionsFromFile;
 
@@ skipping 1551 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
   }
 }