Introduce mash/shell

mash/example/mock_sysui/BUILD.gn

Index: mash/example/mock_sysui/BUILD.gn
diff --git a/mash/example/mock_sysui/BUILD.gn b/mash/example/mock_sysui/BUILD.gn
deleted file mode 100644
index 2e8305e949b14c65da9f46fb73fda8d9359ccc30..0000000000000000000000000000000000000000
--- a/mash/example/mock_sysui/BUILD.gn
+++ /dev/null
@@ -1,34 +0,0 @@
-# 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.
-
-import("//build/config/ui.gni")
-import("//mojo/public/mojo_application.gni")
-import("//mojo/public/tools/bindings/mojom.gni")
-
-mojo_native_application("mock_sysui") {
-  sources = [
-    "main.cc",
-    "mock_sysui.cc",
-    "mock_sysui.h",
-  ]
-
-  deps = [
-    "//base",
-    "//components/mus/public/cpp",
-    "//components/mus/public/interfaces",
-    "//mash/wm/public/interfaces",
-    "//mojo/application/public/cpp",
-    "//mojo/common:common_base",
-    "//mojo/services/tracing/public/cpp",
-    "//skia",
-    "//ui/views",
-    "//ui/views/mus:for_mojo_application",
-  ]
-
-  resources = [ "$root_out_dir/views_mus_resources.pak" ]
-
-  data_deps = [
-    "//components/mus",
-  ]
-}