Add the MultiprocessExec test and its test

util/test/executable_path.h

Index: util/test/executable_path.h
diff --git a/util/test/executable_path.h b/util/test/executable_path.h
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index 0000000000000000000000000000000000000000..4db0bea5739836a173b17d55bc7211abfea98933
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+++ b/util/test/executable_path.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_TEST_EXECUTABLE_PATH_H_
+#define CRASHPAD_UTIL_TEST_EXECUTABLE_PATH_H_
+
+#include "base/files/file_path.h"
+
+namespace crashpad {
+namespace test {
+
+//! \brief Returns the pathname of the currently-running test executable.
+base::FilePath ExecutablePath();
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_TEST_EXECUTABLE_PATH_H_