Fix http://dartbug.com/23578:

runtime/vm/thread_test.cc

Index: runtime/vm/thread_test.cc
diff --git a/runtime/vm/thread_test.cc b/runtime/vm/thread_test.cc
index 63dd249aa7bfac6f5889783b9f3b0666f3203b2f..5cb270b6b4fa73a1c9d89bbfe8e85ec698831175 100644
--- a/runtime/vm/thread_test.cc
+++ b/runtime/vm/thread_test.cc
@@ -12,7 +12,10 @@ namespace dart {
 
 UNIT_TEST_CASE(Mutex) {
   // This unit test case needs a running isolate.
-  Isolate* isolate = Isolate::Init(NULL);
+  Isolate::Flags vm_flags;
+  Dart_IsolateFlags api_flags;
+  vm_flags.CopyTo(&api_flags);
+  Isolate* isolate = Isolate::Init(NULL, api_flags);
 
   Mutex* mutex = new Mutex();
   mutex->Lock();
@@ -34,7 +37,10 @@ UNIT_TEST_CASE(Mutex) {
 
 UNIT_TEST_CASE(Monitor) {
   // This unit test case needs a running isolate.
-  Isolate* isolate = Isolate::Init(NULL);
+  Isolate::Flags vm_flags;
+  Dart_IsolateFlags api_flags;
+  vm_flags.CopyTo(&api_flags);
+  Isolate* isolate = Isolate::Init(NULL, api_flags);
   // Thread interrupter interferes with this test, disable interrupts.
   isolate->set_thread_state(NULL);
   Profiler::EndExecution(isolate);