Creates BackgroundShell and uses it in test

ui/views/run_all_unittests_main.cc

Index: ui/views/run_all_unittests_main.cc
diff --git a/ui/views/run_all_unittests_main.cc b/ui/views/run_all_unittests_main.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5b26c760050149163511abce9e42070e12a3cda1
--- /dev/null
+++ b/ui/views/run_all_unittests_main.cc
@@ -0,0 +1,9 @@
+// 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.
+
+#include "ui/views/run_all_unittests.h"
+
+int main(int argc, char** argv) {
+  views::RunAllUnittests(argc, argv);
+}