Add getter for hasTerminal, terminalColumns and terminalLines on stdout.

runtime/bin/stdin.h

-// 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.
-
-#ifndef BIN_STDIN_H_
-#define BIN_STDIN_H_
-
-#include "bin/builtin.h"
-#include "bin/utils.h"
-
-#include "platform/globals.h"
-
-
-namespace dart {
-namespace bin {
-
-class Stdin {
- public:
-  static int ReadByte();
-
-  static bool GetEchoMode();
-  static void SetEchoMode(bool enabled);
-
-  static bool GetLineMode();
-  static void SetLineMode(bool enabled);
-
- private:
-  DISALLOW_ALLOCATION();
-  DISALLOW_IMPLICIT_CONSTRUCTORS(Stdin);
-};
-
-}  // namespace bin
-}  // namespace dart
-
-#endif  // BIN_STDIN_H_
-