[Fuchsia] Implements the thread interrupter for CPU profiling.

runtime/vm/os_thread_fuchsia.h

 // 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.
 
 #ifndef RUNTIME_VM_OS_THREAD_FUCHSIA_H_
 #define RUNTIME_VM_OS_THREAD_FUCHSIA_H_
 
 #if !defined(RUNTIME_VM_OS_THREAD_H_)
 #error Do not include os_thread_fuchsia.h directly; use os_thread.h instead.
 #endif
 
+#include <magenta/syscalls/object.h>
 #include <pthread.h>
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 
 namespace dart {
 
 typedef pthread_key_t ThreadLocalKey;
-typedef pthread_t ThreadId;
+typedef mx_koid_t ThreadId;
 typedef pthread_t ThreadJoinId;
 
 
 static const ThreadLocalKey kUnsetThreadLocalKey =
     static_cast<pthread_key_t>(-1);
 
 
 class ThreadInlineImpl {
  private:
   ThreadInlineImpl() {}
@@ skipping 40 matching lines @@
 
   friend class Monitor;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(MonitorData);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OS_THREAD_FUCHSIA_H_