Add getter for lineMode and echoMode for Stdin.

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_