Creates BackgroundShell and uses it in test

ui/views/run_all_unittests.h

Index: ui/views/run_all_unittests.h
diff --git a/ui/views/run_all_unittests.h b/ui/views/run_all_unittests.h
new file mode 100644
index 0000000000000000000000000000000000000000..43239f80772f676d77490cd3b070d76cff4ed330
--- /dev/null
+++ b/ui/views/run_all_unittests.h
@@ -0,0 +1,14 @@
+// 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.
+
+#ifndef UI_VIEWS_RUN_ALL_UNITTESTS_H_
+#define UI_VIEWS_RUN_ALL_UNITTESTS_H_
+
+namespace views {
+
+int RunAllUnittests(int argc, char** argv);
+
+}  // namespace
+
+#endif  // UI_VIEWS_RUN_ALL_UNITTESTS_H_