Increase the timeout for the dartc junit tests.

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 1157 matching lines @@
         '-Dcom.google.dart.corelib.SharedTests.test_py=$dartDir/tools/test.py',
         'org.junit.runner.JUnitCore'];
     args.addAll(testClasses);
 
     // Lengthen the timeout for JUnit tests.  It is normal for them
     // to run for a few minutes.
     Map updatedConfiguration = new Map();
     configuration.forEach((key, value) {
       updatedConfiguration[key] = value;
     });
-    updatedConfiguration['timeout'] *= 2;
+    updatedConfiguration['timeout'] *= 3;
     doTest(new TestCase(suiteName,
                         [new Command('java', args)],
                         updatedConfiguration,
                         completeHandler,
                         new Set<String>.from([PASS])));
     doDone();
   }
 
   void completeHandler(TestCase testCase) {
   }
@@ skipping 241 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);
    }
 }