GTTF: Add a basic new unit test launcher.

base/test/unit_test_launcher.h

+// Copyright 2013 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 BASE_TEST_UNIT_TEST_LAUNCHER_H_
+#define BASE_TEST_UNIT_TEST_LAUNCHER_H_
+
+#include "base/callback.h"
+
+namespace base {
+
+// Callback that runs a test suite and returns exit code.
+typedef base::Callback<int(void)> RunTestSuiteCallback;
+
+// Launches unit tests in given test suite. Returns exit code.
+int LaunchUnitTests(int argc,
+                    char** argv,
+                    const RunTestSuiteCallback& run_test_suite);
+
+}   // namespace base
+
+#endif  // BASE_TEST_UNIT_TEST_LAUNCHER_H_