Added class BluetoothDeviceMac, returns mac device timing data

device/bluetooth/bluetooth_low_energy_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_LOW_ENERGY_DEVICE_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 
 #if defined(OS_IOS)
 #import <CoreBluetooth/CoreBluetooth.h>
 #else
 #import <IOBluetooth/IOBluetooth.h>
 #endif
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
-#include "device/bluetooth/bluetooth_device.h"
+#include "device/bluetooth/bluetooth_device_mac.h"
 
 namespace device {
 
 class BluetoothLowEnergyDiscoverManagerMac;
 
-class BluetoothLowEnergyDeviceMac : public BluetoothDevice {
+class BluetoothLowEnergyDeviceMac : public BluetoothDeviceMac {
  public:
   BluetoothLowEnergyDeviceMac(CBPeripheral* peripheral,
                               NSDictionary* advertisementData,
                               int rssi);
   ~BluetoothLowEnergyDeviceMac() override;
 
   int GetRSSI() const;
 
   // BluetoothDevice overrides.
   std::string GetIdentifier() const override;
@@ skipping 30 matching lines @@
       const ConnectToServiceCallback& callback,
       const ConnectToServiceErrorCallback& error_callback) override;
   void ConnectToServiceInsecurely(
       const device::BluetoothUUID& uuid,
       const ConnectToServiceCallback& callback,
       const ConnectToServiceErrorCallback& error_callback) override;
   void CreateGattConnection(
       const GattConnectionCallback& callback,
       const ConnectErrorCallback& error_callback) override;
 
+  // BluetoothDeviceMac override.
+  NSDate* GetLastUpdateTime() const override;
+
  protected:
   // BluetoothDevice override.
   std::string GetDeviceName() const override;
 
   // Updates information about the device.
   virtual void Update(CBPeripheral* peripheral,
                       NSDictionary* advertisementData,
                       int rssi);
 
   static std::string GetPeripheralIdentifier(CBPeripheral* peripheral);
 
  private:
   friend class BluetoothAdapterMac;
 
   // CoreBluetooth data structure.
   base::scoped_nsobject<CBPeripheral> peripheral_;
 
   // RSSI value.
   int rssi_;
 
   // Whether the device is connectable.
   bool connectable_;
 
+  // Stores the time of the most recent call to Update().
+  base::scoped_nsobject<NSDate> last_update_time_;
+
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyDeviceMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_