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

runtime/bin/directory_test.cc

 // Copyright (c) 2016, 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 "bin/directory.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/isolate.h"
 #include "vm/thread.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
-UNIT_TEST_CASE(DirectoryCurrentNoScope) {
+VM_UNIT_TEST_CASE(DirectoryCurrentNoScope) {
   char* current_dir = dart::bin::Directory::CurrentNoScope();
   EXPECT_NOTNULL(current_dir);
   free(current_dir);
 }
 
 
 TEST_CASE(DirectoryCurrent) {
   const char* current = dart::bin::Directory::Current();
   EXPECT_NOTNULL(current);
 }
@@ skipping 116 matching lines @@
 
   r = dart::bin::Directory::Exists(name);
   EXPECT_EQ(dart::bin::Directory::DOES_NOT_EXIST, r);
 
   EXPECT(dart::bin::Directory::Delete(new_name, false));
   delete[] name;
   delete[] new_name;
 }
 
 }  // namespace dart