Add a sleep function to dart:io

runtime/bin/process.cc

Index: runtime/bin/process.cc
diff --git a/runtime/bin/process.cc b/runtime/bin/process.cc
index ac75854da63e1d827583a0e1e2d4e0ddf42e2fba..4e5010d2c6fcb3131512f02936455d79d91b666d 100644
--- a/runtime/bin/process.cc
+++ b/runtime/bin/process.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2013, 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.
 
@@ -9,6 +9,7 @@
 
 #include "include/dart_api.h"
 
+#include "platform/platform_os.h"
 
 static const int kProcessIdNativeField = 0;
 
@@ -190,6 +191,16 @@ void FUNCTION_NAME(Process_SetExitCode)(Dart_NativeArguments args) {
 }
 
 
+void FUNCTION_NAME(Process_Sleep)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  int64_t milliseconds = 0;
+  // Ignore result if passing invalid argument and just set exit code to 0.
+  DartUtils::GetInt64Value(Dart_GetNativeArgument(args, 0), &milliseconds);
+  platform::OS::Sleep(milliseconds);
+  Dart_ExitScope();
+}
+
+
 Dart_Handle Process::GetProcessIdNativeField(Dart_Handle process,
                                              intptr_t* pid) {
   return Dart_GetNativeInstanceField(process, kProcessIdNativeField, pid);