Remove race(s) in vmservice tests.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 808 matching lines @@
 
 DART_EXPORT void* Dart_CurrentIsolateData() {
   Isolate* isolate = Isolate::Current();
   CHECK_ISOLATE(isolate);
   return isolate->init_callback_data();
 }
 
 
 DART_EXPORT Dart_Handle Dart_DebugName() {
   Isolate* isolate = Isolate::Current();
-  CHECK_ISOLATE(isolate);
+  DARTSCOPE(isolate);
   return Api::NewHandle(isolate, String::New(isolate->name()));
 }
 
 
 
 DART_EXPORT void Dart_EnterIsolate(Dart_Isolate dart_isolate) {
   CHECK_NO_ISOLATE(Isolate::Current());
   Isolate* isolate = reinterpret_cast<Isolate*>(dart_isolate);
   Isolate::SetCurrent(isolate);
 }
@@ skipping 3326 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success();
 }
 
 }  // namespace dart