Add echo and line modes to Stdin.

runtime/bin/stdin.h

Index: runtime/bin/stdin.h
diff --git a/runtime/bin/stdin.cc b/runtime/bin/stdin.h
similarity index 51%
copy from runtime/bin/stdin.cc
copy to runtime/bin/stdin.h
index 6dba2130ad8e9526c2fe8b4092ebf565038e828c..931e04f070c97f74859660061e6a9c45f64df3af 100644
--- a/runtime/bin/stdin.cc
+++ b/runtime/bin/stdin.h
@@ -2,30 +2,31 @@
 // 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/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();
-}
+class Stdin {
+ public:
+  static int ReadByte();
+  static void SetEchoMode(bool enabled);
+  static void SetLineMode(bool enabled);
+
+ private:
+  DISALLOW_ALLOCATION();
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Stdin);
+};
 
 }  // namespace bin
 }  // namespace dart
+
+#endif  // BIN_STDIN_H_
+