Convert mus apptests to shelltests

mojo/shell/public/cpp/test/BUILD.gn

Index: mojo/shell/public/cpp/test/BUILD.gn
diff --git a/mojo/shell/public/cpp/test/BUILD.gn b/mojo/shell/public/cpp/test/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d074dbcc30c68c4eac3f58502fb2c58d717ef570
--- /dev/null
+++ b/mojo/shell/public/cpp/test/BUILD.gn
@@ -0,0 +1,28 @@
+# Copyright 2016 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("//testing/test.gni")
+
+group("test") {
+  testonly = true
+  deps = [
+    ":run_all_shelltests",
+  ]
+}
+
+source_set("run_all_shelltests") {
+  testonly = true
+
+  sources = [
+    "run_all_shelltests.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//mojo/edk/system",
+    "//mojo/shell/background:lib",
+    "//mojo/shell/background:main",
+  ]
+}