Check in generated Dart bindings and add presubmit script

mojo/dart/packages/mojo_services/lib/mojo/files/ioctl.mojom.dart

Index: mojo/dart/packages/mojo_services/lib/mojo/files/ioctl.mojom.dart
diff --git a/mojo/dart/test/import_mojo.dart b/mojo/dart/packages/mojo_services/lib/mojo/files/ioctl.mojom.dart
similarity index 64%
copy from mojo/dart/test/import_mojo.dart
copy to mojo/dart/packages/mojo_services/lib/mojo/files/ioctl.mojom.dart
index 7a532d8d776ee63519e446462e3b02247e90c27a..b8fc83c4484a0ecb22640f3813bce05ce9f4fc13 100644
--- a/mojo/dart/test/import_mojo.dart
+++ b/mojo/dart/packages/mojo_services/lib/mojo/files/ioctl.mojom.dart
@@ -2,11 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+library ioctl_mojom;
+
+import 'dart:async';
+
 import 'package:mojo/bindings.dart' as bindings;
 import 'package:mojo/core.dart' as core;
+const kIoctlInvalid = 0;
+const kIoctlTerminal = 1;
+
+
 
-main() {
-  core.MojoMessagePipe pipe = new core.MojoMessagePipe();
-  pipe.endpoints[0].handle.close();
-  pipe.endpoints[1].handle.close();
-}