Mojo: Add an extremely skeletal mojo_shell_tests.

mojo/shell/shell_test_base.h

+// Copyright 2014 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 MOJO_SHELL_SHELL_TEST_BASE_H_
+#define MOJO_SHELL_SHELL_TEST_BASE_H_
+
+#include "base/at_exit.h"
+#include "base/macros.h"
+#include "mojo/public/cpp/environment/environment.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace shell {
+namespace test {
+
+class ShellTestBase : public testing::Test {
+ public:
+  ShellTestBase();
+  virtual ~ShellTestBase();
+
+ private:
+  base::ShadowingAtExitManager at_exit_manager_;
+  Environment environment_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellTestBase);
+};
+
+}  // namespace test
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_SHELL_SHELLASE_H_