ipc: Write end-to-end tests for SharedMemoryHandle brokering on Mac.

ipc/test_util_mac.cc

 // 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.
 
 #include "ipc/test_util_mac.h"
 
 #include <servers/bootstrap.h>
 
 #include "base/mac/mach_logging.h"
 #include "base/mac/scoped_mach_port.h"
@@ skipping 82 matching lines @@
   mach_port_name_array_t name_array;
   mach_msg_type_number_t names_count;
   mach_port_type_array_t type_array;
   mach_msg_type_number_t types_count;
   kern_return_t kr = mach_port_names(mach_task_self(), &name_array,
                                      &names_count, &type_array, &types_count);
   MACH_CHECK(kr == KERN_SUCCESS, kr) << "GetActiveNameCount";
   return names_count;
 }
 
+mach_port_urefs_t GetMachRefCount(mach_port_name_t name,
+                                  mach_port_right_t right) {
+  mach_port_urefs_t ref_count;
+  kern_return_t kr = mach_port_get_refs(mach_task_self(), name,
+                                        MACH_PORT_RIGHT_SEND, &ref_count);
+  MACH_CHECK(kr == KERN_SUCCESS, kr) << "GetRefCount";
+  return ref_count;
+}
+
 void IncrementMachRefCount(mach_port_name_t name, mach_port_right_t right) {
   kern_return_t kr = mach_port_mod_refs(mach_task_self(), name, right, 1);
   MACH_CHECK(kr == KERN_SUCCESS, kr) << "GetRefCount";
 }
 
 }  // namespace IPC