Replace IOSurfaceManager by directly passing IOSurface Mach ports over Chrome IPC.

base/mac/scoped_mach_port.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_MAC_SCOPED_MACH_PORT_H_
 #define BASE_MAC_SCOPED_MACH_PORT_H_
 
 #include <mach/mach.h>
 
 #include "base/base_export.h"
+#include "base/mac/scoped_typeref.h"
 #include "base/scoped_generic.h"
 
 namespace base {
 namespace mac {
 
 namespace internal {
 
 struct BASE_EXPORT SendRightTraits {
   static mach_port_t InvalidValue() {
     return MACH_PORT_NULL;
@@ skipping 11 matching lines @@
 };
 
 struct PortSetTraits {
   static mach_port_t InvalidValue() {
     return MACH_PORT_NULL;
   }
 
   BASE_EXPORT static void Free(mach_port_t port);
 };
 
+struct RefCountedSendRighTraits {
+  BASE_EXPORT static void Retain(mach_port_t);
+  BASE_EXPORT static void Release(mach_port_t);
+};
+
 }  // namespace internal
 
 // A scoper for handling a Mach port that names a send right. Send rights are
 // reference counted, and this takes ownership of the right on construction
 // and then removes a reference to the right on destruction. If the reference
 // is the last one on the right, the right is deallocated.
 using ScopedMachSendRight =
     ScopedGeneric<mach_port_t, internal::SendRightTraits>;
 
 // A scoper for handling a Mach port's receive right. There is only one
 // receive right per port. This takes ownership of the receive right on
 // construction and then destroys the right on destruction, turning all
 // outstanding send rights into dead names.
 using ScopedMachReceiveRight =
     ScopedGeneric<mach_port_t, internal::ReceiveRightTraits>;
 
 // A scoper for handling a Mach port set. A port set can have only one
 // reference. This takes ownership of that single reference on construction and
 // destroys the port set on destruction. Destroying a port set does not destroy
 // the receive rights that are members of the port set.
 using ScopedMachPortSet = ScopedGeneric<mach_port_t, internal::PortSetTraits>;
 
+// A scoper for handling Mach port names that are send rights. Unlike
+// ScopedMachSendRight, this scoper is both copyable and assignable, which will
+// increase the kernel reference count of the right. Otherwise, this behaves
+// the same as ScopedMachSendRight.
+using ScopedRefCountedMachSendRight =
+    ScopedTypeRef<mach_port_t, internal::RefCountedSendRighTraits>;
+
 }  // namespace mac
 }  // namespace base
 
 #endif  // BASE_MAC_SCOPED_MACH_PORT_H_