Add NewMachPort() and its test, and switch call sites to use it

util/mach/mach_extensions.h

 // 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,
@@ skipping 49 matching lines @@
 //! Callers can use this function in preference to `mach_thread_self()`. This
 //! function returns an extant reference to the current thread’s port without
 //! incrementing its reference count.
 //!
 //! \return The value of `mach_thread_self()` without incrementing its reference
 //!     count. The returned port must not be deallocated by
 //!     `mach_port_deallocate()`. The returned value is valid as long as the
 //!     thread continues to exist as a `pthread_t`.
 thread_t MachThreadSelf();
 
+//! \brief Creates a new Mach port in the current task.
+//!
+//! This function wraps the `mach_port_allocate()` providing a simpler
+//! interface.
+//!
+//! \param[in] right The type of right to create.
+//!
+//! \return The new Mach port. On failure, `MACH_PORT_NULL` with a message
+//!     logged.
+mach_port_t NewMachPort(mach_port_right_t right);
+
 //! \brief The value for `EXC_MASK_ALL` appropriate for the operating system at
 //!     run time.
 //!
 //! The SDK’s definition of `EXC_MASK_ALL` has changed over time, with later
 //! versions containing more bits set than earlier versions. However, older
 //! kernels will reject exception masks that contain bits set that they don’t
 //! recognize. Calling this function will return a value for `EXC_MASK_ALL`
 //! appropriate for the system at run time.
 //!
 //! \note `EXC_MASK_ALL` does not include the value of `EXC_MASK_CRASH`.
 //!     Consumers that want `EXC_MASK_ALL` along with `EXC_MASK_CRASH` must use
 //!     ExcMaskAll() | `EXC_MASK_CRASH` explicitly.
 exception_mask_t ExcMaskAll();
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MACH_MACH_EXTENSIONS_H_