Moterm part 1: Add MotermModel, a "model" for terminal emulation.

apps/BUILD.gn

Index: apps/BUILD.gn
diff --git a/mojo/python/mojo_utils/__init__.py b/apps/BUILD.gn
similarity index 66%
copy from mojo/python/mojo_utils/__init__.py
copy to apps/BUILD.gn
index 50b23dff631dbfd12f490f20fe2a2871179b73b9..760232208bee8049026c0641dcdfa28d8b4d5b0e 100644
--- a/mojo/python/mojo_utils/__init__.py
+++ b/apps/BUILD.gn
@@ -1,3 +1,11 @@
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
+
+group("apps") {
+  testonly = true
+
+  deps = [
+    "//apps/moterm:apptests",
+  ]
+}