Added new type of unit test, RAW_UNIT_TEST_CASE, which is used for tests that can be flaky if run w…

runtime/vm/thread_barrier_test.cc

 // Copyright (c) 2015, 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.
 
 #include "platform/assert.h"
 #include "vm/random.h"
 #include "vm/thread_barrier.h"
 #include "vm/thread_pool.h"
 #include "vm/unit_test.h"
 
@@ skipping 19 matching lines @@
       OS::Sleep(ms);
     }
   }
 
   const intptr_t num_rounds_;
   ThreadBarrier* barrier_;
   Random rng_;
 };
 
 
-UNIT_TEST_CASE(ThreadBarrier) {
+VM_UNIT_TEST_CASE(ThreadBarrier) {
   static const intptr_t kNumTasks = 5;
   static const intptr_t kNumRounds = 500;
 
   Monitor* monitor = new Monitor();
   Monitor* monitor_done = new Monitor();
   {
     ThreadBarrier barrier(kNumTasks + 1, monitor, monitor_done);
     for (intptr_t i = 0; i < kNumTasks; ++i) {
       Dart::thread_pool()->Run(new FuzzTask(kNumRounds, &barrier, i + 1));
     }
     for (intptr_t i = 0; i < kNumRounds; ++i) {
       barrier.Sync();
     }
     barrier.Exit();
   }
 
   delete monitor_done;
   delete monitor;
 }
 
 }  // namespace dart