Add BootstrapCheckIn and its test

util/mach/bootstrap.h

Index: util/mach/bootstrap.h
diff --git a/util/mach/bootstrap.h b/util/mach/bootstrap.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_MACH_BOOTSTRAP_H_
+#define CRASHPAD_UTIL_MACH_BOOTSTRAP_H_
+
+#include <mach/mach.h>
+
+#include <string>
+
+namespace crashpad {
+
+//! \brief Calls `bootstrap_check_in()` to check in with the bootstrap server.
+//!
+//! \param[in] bp The bootstrap server to check in with.
+//! \param[in] service_name The name of the service to check in.
+//! \param[out] service_port The receive right for the checked-in service.
+//!
+//! \return `BOOTSTRAP_SUCCESS` on success, with \a service_port set
+//!     appropriately. Otherwise, any error that might be returned by
+//!     `bootstrap_check_in()`.
+//!
+//! This function is a wrapper around `bootstrap_check_in()`, checking in with
+//! the bootstrap server at \a bp. It exists primarily for compatibility with
+//! Mac OS X 10.5, where it is not possible to call `bootstrap_check_in()` for a
+//! \a service_name that has not already been registered with the bootstrap
+//! server using `bootstrap_register()`. `bootstrap_register()` was deprecated
+//! in Mac OS X 10.5.
+kern_return_t BootstrapCheckIn(mach_port_t bp,
+                               const std::string& service_name,
+                               mach_port_t* service_port);
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_MACH_MACH_MESSAGE_SERVER_H_