[mojo-edk] Add support for transferring mach ports.

mojo/edk/embedder/platform_handle.cc

 // Copyright 2013 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 "mojo/edk/embedder/platform_handle.h"
 
 #include "build/build_config.h"
 #if defined(OS_POSIX)
 #include <unistd.h>
 #elif defined(OS_WIN)
@@ skipping 11 matching lines @@
   if (!is_valid())
     return;
 
 #if defined(OS_POSIX)
   if (type == Type::POSIX) {
     bool success = (close(handle) == 0);
     DPCHECK(success);
     handle = -1;
   }
 #if defined(OS_MACOSX) && !defined(OS_IOS)
-  else {
-     kern_return_t rv = mach_port_deallocate(mach_task_self(), port);
-     DPCHECK(rv == KERN_SUCCESS);
-     port = MACH_PORT_NULL;
+  else if (type == Type::MACH) {
+    kern_return_t rv = mach_port_deallocate(mach_task_self(), port);
+    DPCHECK(rv == KERN_SUCCESS);
+    port = MACH_PORT_NULL;
   }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 #elif defined(OS_WIN)
   bool success = !!CloseHandle(handle);
   DPCHECK(success);
   handle = INVALID_HANDLE_VALUE;
 #else
 #error "Platform not yet supported."
 #endif
 }
 
 }  // namespace edk
 }  // namespace mojo