Fuchsia: Initial check-in.

runtime/vm/os_thread_fuchsia.h

Index: runtime/vm/os_thread_fuchsia.h
diff --git a/runtime/vm/os_thread_linux.h b/runtime/vm/os_thread_fuchsia.h
similarity index 85%
copy from runtime/vm/os_thread_linux.h
copy to runtime/vm/os_thread_fuchsia.h
index 306229bd1fde75cee6dc2f25f2ede9a515ff514f..b45207be952ae50059e501c846bc342bca0d79c2 100644
--- a/runtime/vm/os_thread_linux.h
+++ b/runtime/vm/os_thread_fuchsia.h
@@ -1,12 +1,12 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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 VM_OS_THREAD_LINUX_H_
-#define VM_OS_THREAD_LINUX_H_
+#ifndef VM_OS_THREAD_FUCHSIA_H_
+#define VM_OS_THREAD_FUCHSIA_H_
 
 #if !defined(VM_OS_THREAD_H_)
-#error Do not include os_thread_linux.h directly; use os_thread.h instead.
+#error Do not include os_thread_fuchsia.h directly; use os_thread.h instead.
 #endif
 
 #include <pthread.h>
@@ -77,4 +77,4 @@ class MonitorData {
 
 }  // namespace dart
 
-#endif  // VM_OS_THREAD_LINUX_H_
+#endif  // VM_OS_THREAD_FUCHSIA_H_