mac: Add auto-close and share-read-only functionality to SharedMemory.

ipc/test_util_mac.h

 // Copyright 2015 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.
 
 // This file contains Mac-specific utility functions used by multiple test
 // suites.
 
 #ifndef IPC_TEST_UTIL_MAC_H_
 #define IPC_TEST_UTIL_MAC_H_
 
@@ skipping 32 matching lines @@
 // The number of active names in the current task's port name space.
 mach_msg_type_number_t GetActiveNameCount();
 
 // The number of references the current task has for a given name.
 mach_port_urefs_t GetMachRefCount(mach_port_name_t name,
                                   mach_port_right_t right);
 
 // Increments the ref count for the right/name pair.
 void IncrementMachRefCount(mach_port_name_t name, mach_port_right_t right);
 
+// Gets the current and maximum protection levels of the memory region.
+// Returns whether the operation was successful.
+// |current| and |max| are output variables only populated on success.
+bool GetMachProtections(void* address, size_t size, int* current, int* max);
+
 }  // namespace IPC
 
 #endif  // IPC_TEST_UTIL_MAC_H_