ipc: Update MachPortMac ownership semantics.

ipc/mach_port_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/mach_port_mac.h"
 
 #include "base/logging.h"
+#include "base/mac/mach_logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_number_conversions.h"
 #include "ipc/mach_port_attachment_mac.h"
 
 namespace IPC {
 
-// static
+MachPortMac::MachPortMac(const mach_port_t& mach_port) : mach_port_(mach_port) {
+  if (mach_port != MACH_PORT_NULL) {
+    kern_return_t kr = mach_port_mod_refs(mach_task_self(), mach_port,
+                                          MACH_PORT_RIGHT_SEND, 1);
+    MACH_LOG_IF(ERROR, kr != KERN_SUCCESS, kr)
+        << "MachPortMac mach_port_mod_refs";
+  }
+}
+
+  // static
 void ParamTraits<MachPortMac>::Write(Message* m, const param_type& p) {
   if (!m->WriteAttachment(
           new IPC::internal::MachPortAttachmentMac(p.get_mach_port()))) {
     NOTREACHED();
   }
 }
 
 // static
 bool ParamTraits<MachPortMac>::Read(const Message* m,
                                     base::PickleIterator* iter,
@@ skipping 14 matching lines @@
   r->set_mach_port(mach_port_attachment->get_mach_port());
   return true;
 }
 
 // static
 void ParamTraits<MachPortMac>::Log(const param_type& p, std::string* l) {
   l->append(base::StringPrintf("mach port: 0x%X", p.get_mach_port()));
 }
 
 }  // namespace IPC