Add getter for hasTerminal, terminalColumns and terminalLines on stdout.

tests/standalone/io/stdin_sync_test.dart

 // 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.
 
 import "dart:convert";
 import "dart:io";
 
 import "package:path/path.dart";
 import "package:expect/expect.dart";
 
@@ skipping 26 matching lines @@
 
   test("hej\u0187", ['hej\u0187']);
 
   test("hej\rhej\nhej\r", ['hej\rhej', 'hej\r']);
 
   test("hej\r\r\nhej\r\nhej\r", ['hej\r', 'hej', 'hej\r']);
 
   test("hej", ['hej']);
 }
 
+
 void testEchoMode() {
   stdin.echoMode = true;
   Expect.isTrue(stdin.echoMode);
   stdin.echoMode = false;
   Expect.isFalse(stdin.echoMode);
   var line;
   while ((line = stdin.readLineSync()) != null) {
     print("You typed: $line");
   }
 }
 
+
 void testLineMode() {
   stdin.lineMode = true;
   Expect.isTrue(stdin.lineMode);
   stdin.lineMode = false;
   Expect.isFalse(stdin.lineMode);
   var char;
   while ((char = stdin.readByteSync()) != -1) {
     print("You typed: $char");
   }
 }
 
 
 void main() {
   testReadByte();
 
-  // testEchoMode and testLineMode is an developer-interactive test, thus not
+  // testEchoMode and testLineMode is developer-interactive tests, thus not
   // enabled.
   //testEchoMode();
   //testLineMode();
 }