Add CFPropertyToLaunchData() and its test

util/mac/launchd.h

Index: util/mac/launchd.h
diff --git a/util/mac/launchd.h b/util/mac/launchd.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_MAC_LAUNCHD_H_
+#define CRASHPAD_UTIL_MAC_LAUNCHD_H_
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <launch.h>
+
+namespace crashpad {
+
+//! \brief Converts a Core Foundation-type property list to a launchd-type
+//!     `launch_data_t`.
+//!
+//! \param[in] property_cf The Core Foundation-type property list to convert.
+//!
+//! \return The converted launchd-type `launch_data_t`. The caller takes
+//!     ownership of the returned value. On error, returns `NULL`.
+//!
+//! \note This function handles all `CFPropertyListRef` types except for
+//!     `CFDateRef`, because there’s no `launch_data_type_t` analogue. Not all
+//!     types supported in a launchd-type `launch_data_t` have
+//!     `CFPropertyListRef` analogues.
+launch_data_t CFPropertyToLaunchData(CFPropertyListRef property_cf);
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_MAC_LAUNCHD_H_