Add Stdio.readByteSync and Stdio.readLineSync.

runtime/bin/stdin.cc

Index: runtime/bin/stdin.cc
diff --git a/runtime/bin/stdin.cc b/runtime/bin/stdin.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6dba2130ad8e9526c2fe8b4092ebf565038e828c
--- /dev/null
+++ b/runtime/bin/stdin.cc
@@ -0,0 +1,31 @@
+// 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.
+
+#include "bin/builtin.h"
+#include "bin/dartutils.h"
+#include "bin/thread.h"
+#include "bin/utils.h"
+
+#include "platform/globals.h"
+#include "platform/thread.h"
+#include "platform/utils.h"
+
+#include "include/dart_api.h"
+
+
+namespace dart {
+namespace bin {
+
+void FUNCTION_NAME(Stdin_ReadByte)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  int c = getchar();
+  if (c == EOF) {
+    c = -1;
+  }
+  Dart_SetReturnValue(args, Dart_NewInteger(c));
+  Dart_ExitScope();
+}
+
+}  // namespace bin
+}  // namespace dart