Added class BluetoothDeviceMac, returns mac device timing data

device/bluetooth/bluetooth_device_mac.h

+// 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.
+
+#ifndef DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_MAC_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_MAC_H_
+
+#include "device/bluetooth/bluetooth_device.h"
+
+@class NSDate;
+
+namespace device {
+
+class BluetoothDeviceMac : public BluetoothDevice {
+ public:
+  ~BluetoothDeviceMac() override;
+
+  // Returns the time of the most recent interaction with the device.  Returns
+  // nil if the device has never been seen.
+  virtual NSDate* GetLastUpdateTime() const = 0;
+
+ protected:
+  BluetoothDeviceMac();
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothDeviceMac);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_MAC_H_