Introduce mash/shell

mash/shell/BUILD.gn

+# 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")
+import("//tools/grit/repack.gni")
+
+mojo_native_application("shell") {
+  output_name = "mash_shell"
+
+  sources = [
+    "main.cc",
+    "shell_application_delegate.cc",
+    "shell_application_delegate.h",
+  ]
+
+  deps = [
+    "//base",
+    "//mojo/application/public/cpp",
+    "//mojo/application/public/cpp:sources",
+    "//mojo/public/cpp/bindings",
+  ]
+
+  data_deps = [
+    "//mash/system_ui",
+    "//mash/wm",
+  ]
+}