Fix summary report count of tests run by test.dart when tests are run on a browser.

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 374 matching lines @@
       int shard = configuration['shard'];
       if (testName.hashCode() % shards != shard - 1) {
         return;
       }
     }
 
     Set<String> expectations = testExpectations.expectations(testName);
     if (configuration['report']) {
       // Tests with multiple VMOptions are counted more than once.
       for (var dummy in optionsFromFile["vmOptions"]) {
+        if (TestUtils.isBrowserRuntime(configuration['runtime']) &&
+            optionsFromFile['isMultitest']) {
+          break;  // Browser tests skip multitests.
+        }
         SummaryReport.add(expectations);
       }
     }
     if (expectations.contains(SKIP)) return;
 
     if (TestUtils.isBrowserRuntime(configuration['runtime'])) {
       enqueueBrowserTest(info, testName, expectations);
     } else {
       enqueueStandardTest(info, testName, expectations);
     }
@@ skipping 962 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $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
 """;
     print(report);
    }
 }