Fix builds

runtime/vm/thread.h

 // Copyright (c) 2015, 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.
 
 #ifndef VM_THREAD_H_
 #define VM_THREAD_H_
 
 #include "vm/globals.h"
 #include "vm/handles.h"
 #include "vm/os_thread.h"
@@ skipping 483 matching lines @@
   void Schedule(Isolate* isolate, bool bypass_safepoint = false);
   void Unschedule(bool bypass_safepoint = false);
 
 #define REUSABLE_FRIEND_DECLARATION(name)                                      \
   friend class Reusable##name##HandleScope;
 REUSABLE_HANDLE_LIST(REUSABLE_FRIEND_DECLARATION)
 #undef REUSABLE_FRIEND_DECLARATION
 
   friend class ApiZone;
   friend class Isolate;
+  friend class Simulator;
   friend class StackZone;
   friend class ThreadIterator;
   friend class ThreadIteratorTestHelper;
   friend class ThreadRegistry;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 
 // Note that this takes the thread list lock, prohibiting threads from coming
@@ skipping 14 matching lines @@
 };
 
 #if defined(TARGET_OS_WINDOWS)
 // Clears the state of the current thread and frees the allocation.
 void WindowsThreadCleanUp();
 #endif
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_