[sensors] [mac] Implement ambient light sensor for macOS

base/mac/scoped_ionotificationportref.h

Index: base/mac/scoped_ionotificationportref.h
diff --git a/base/mac/scoped_ionotificationportref.h b/base/mac/scoped_ionotificationportref.h
new file mode 100644
index 0000000000000000000000000000000000000000..93ebc98b65bbbc56ad66588a054bccb51912636a
--- /dev/null
+++ b/base/mac/scoped_ionotificationportref.h
@@ -0,0 +1,33 @@
+// Copyright 2016 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_IONOTIFICATIONPORTREF_H_
+#define BASE_MAC_SCOPED_IONOTIFICATIONPORTREF_H_
+
+#include <IOKit/IOKitLib.h>
+
+#include "base/scoped_generic.h"
+
+namespace base {
+namespace mac {
+
+namespace internal {
+
+struct ScopedIONotificationPortRefTraits {
+  static IONotificationPortRef InvalidValue() { return nullptr; }
+  static void Free(IONotificationPortRef object) {
+    IONotificationPortDestroy(object);
+  }
+};
+
+}  // namepsace internal
+
+using ScopedIONotificationPortRef =
+    ScopedGeneric<IONotificationPortRef,
+                  internal::ScopedIONotificationPortRefTraits>;
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_SCOPED_IONOTIFICATIONPORTREF_H_