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

runtime/vm/custom_isolate_test.cc

 // 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.
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
 #include "vm/unit_test.h"
 
 // Custom Isolate Test.
@@ skipping 297 matching lines @@
 
   Dart_Handle send_port = Dart_NewSendPort(main_port_id);
   EXPECT_VALID(send_port);
   Dart_SetReturnValue(args, send_port);
 
   OS::Print("-- Exit: CustomIsolateImpl_start --\n");
   Dart_ExitScope();
 }
 
 
-UNIT_TEST_CASE(CustomIsolates) {
+VM_UNIT_TEST_CASE(CustomIsolates) {
   bool saved_flag = FLAG_trace_shutdown;
   FLAG_trace_shutdown = true;
   FLAG_verify_handles = true;
 #ifdef DEBUG
   FLAG_verify_on_transition = true;
 #endif
   event_queue = new EventQueue();
 
   Dart_Isolate dart_isolate = TestCase::CreateTestIsolate();
   EXPECT(dart_isolate != NULL);
@@ skipping 27 matching lines @@
   OS::Print("-- Finished event loop --\n");
   EXPECT_STREQ("Received: 43", saved_echo);
   free(saved_echo);
 
   delete event_queue;
   event_queue = NULL;
   FLAG_trace_shutdown = saved_flag;
 }
 
 }  // namespace dart