Begin migration of InterruptableThreadState into Thread.

runtime/vm/thread_test.cc

 // Copyright (c) 2012, 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/isolate.h"
 #include "vm/lockers.h"
 #include "vm/unit_test.h"
 #include "vm/profiler.h"
 #include "vm/thread_pool.h"
@@ skipping 20 matching lines @@
   // purpose.
   Dart_ShutdownIsolate();
   delete mutex;
 }
 
 
 UNIT_TEST_CASE(Monitor) {
   // This unit test case needs a running isolate.
   Dart_CreateIsolate(
       NULL, NULL, bin::isolate_snapshot_buffer, NULL, NULL, NULL);
-  Isolate* isolate = Isolate::Current();
+  Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
   // Thread interrupter interferes with this test, disable interrupts.
-  isolate->set_thread_state(NULL);
+  thread->set_thread_state(NULL);
   Profiler::EndExecution(isolate);
   Monitor* monitor = new Monitor();
   monitor->Enter();
   monitor->Exit();
 
   const int kNumAttempts = 5;
   int attempts = 0;
   while (attempts < kNumAttempts) {
     MonitorLocker ml(monitor);
     int64_t start = OS::GetCurrentTimeMillis();
@@ skipping 377 matching lines @@
   while (true) {
     isolate->thread_registry()->CheckSafepoint();
     MutexLocker ml(&mutex);
     if (exited == SafepointTestTask::kTaskCount) {
       break;
     }
   }
 }
 
 }  // namespace dart