Add Stdio.readByteSync and Stdio.readLineSync.

runtime/bin/stdio_patch.dart

Index: runtime/bin/stdio_patch.dart
diff --git a/runtime/bin/stdio_patch.dart b/runtime/bin/stdio_patch.dart
index 90b3a41fad2b4bfa3fcab92d075771d257634d32..8bc3d677785497abea357ab32262e4bef3a82baa 100644
--- a/runtime/bin/stdio_patch.dart
+++ b/runtime/bin/stdio_patch.dart
@@ -8,9 +8,9 @@ patch class _StdIOUtils {
       case _STDIO_HANDLE_TYPE_TERMINAL:
       case _STDIO_HANDLE_TYPE_PIPE:
       case _STDIO_HANDLE_TYPE_SOCKET:
-        return new _StdStream(new _Socket._readPipe(0));
+        return new Stdin._(new _Socket._readPipe(0));
       case _STDIO_HANDLE_TYPE_FILE:
-        return new _StdStream(new _FileStream.forStdin());
+        return new Stdin._(new _FileStream.forStdin());
       default:
         throw new FileException("Unsupported stdin type");
     }
@@ -39,6 +39,10 @@ patch class _StdIOUtils {
   }
 }
 
+patch class Stdin {
+  /* patch */ int readByteSync() native "Stdin_ReadByte";
+}
+
 
 _getStdioHandle(_NativeSocket socket, int num) native "Socket_GetStdioHandle";
 _getStdioHandleType(int num) native "File_GetStdioHandleType";