Reland 1: "mac: Add auto-close and share-read-only functionality to SharedMemory."

ipc/test_util_mac.h

Index: ipc/test_util_mac.h
diff --git a/ipc/test_util_mac.h b/ipc/test_util_mac.h
index e976ce0a3c3e5acad8a453212ffc0c17c17a3da7..6ed4d1966a8f17e38281c800e76423db9ba2ec1f 100644
--- a/ipc/test_util_mac.h
+++ b/ipc/test_util_mac.h
@@ -50,6 +50,11 @@ mach_port_urefs_t GetMachRefCount(mach_port_name_t name,
 // 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_