Add base::mac::ScopedMachPort::release()

base/mac/scoped_mach_port.h

Index: base/mac/scoped_mach_port.h
diff --git a/base/mac/scoped_mach_port.h b/base/mac/scoped_mach_port.h
index 0b2ac7fc6c4240cee85c20b7b713332fda716233..a98ca5ebaf854862572f89e9d567af9bce4c610f 100644
--- a/base/mac/scoped_mach_port.h
+++ b/base/mac/scoped_mach_port.h
@@ -9,6 +9,7 @@
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 
 namespace base {
 namespace mac {
@@ -32,6 +33,12 @@ class BASE_EXPORT ScopedMachPort {
     return port_;
   }
 
+  mach_port_t release() WARN_UNUSED_RESULT {
+    mach_port_t temp = port_;
+    port_ = MACH_PORT_NULL;
+    return temp;
+  }
+
  private:
   mach_port_t port_;