Fuchsia: Initial check-in.

runtime/vm/signal_handler_fuchsia.cc

Index: runtime/vm/signal_handler_fuchsia.cc
diff --git a/runtime/vm/signal_handler_win.cc b/runtime/vm/signal_handler_fuchsia.cc
similarity index 84%
copy from runtime/vm/signal_handler_win.cc
copy to runtime/vm/signal_handler_fuchsia.cc
index bb6b92d01fe6a665c94b33bc8743bd35b3d5c8f4..1b704ebcd9199fddeabac551a181e8695ca3af49 100644
--- a/runtime/vm/signal_handler_win.cc
+++ b/runtime/vm/signal_handler_fuchsia.cc
@@ -1,10 +1,13 @@
-// Copyright (c) 2013, 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.
 
 #include "vm/globals.h"
+#if defined(TARGET_OS_FUCHSIA)
+
 #include "vm/signal_handler.h"
-#if defined(TARGET_OS_WINDOWS)
+
+#include "platform/assert.h"
 
 namespace dart {
 
@@ -47,7 +50,6 @@ void SignalHandler::Remove() {
   UNIMPLEMENTED();
 }
 
-
 }  // namespace dart
 
-#endif  // defined(TARGET_OS_WINDOWS)
+#endif  // defined(TARGET_OS_FUCHSIA)