Added class BluetoothDeviceMac, returns mac device timing data

device/bluetooth/bluetooth_low_energy_device_mac.mm

Index: device/bluetooth/bluetooth_low_energy_device_mac.mm
diff --git a/device/bluetooth/bluetooth_low_energy_device_mac.mm b/device/bluetooth/bluetooth_low_energy_device_mac.mm
index 0357ad95276aca951b3d3a10d7032ff4c230c32f..c425fdae82eba9c115b0b085341583ecaf25bb40 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.mm
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.mm
@@ -75,6 +75,7 @@ BluetoothLowEnergyDeviceMac::~BluetoothLowEnergyDeviceMac() {
 void BluetoothLowEnergyDeviceMac::Update(CBPeripheral* peripheral,

[scheib, 2015/06/30 16:58:18]

If a device is known, added to the adapter, and then is discovered again in a
later scan we intend to call ::Update again, right?

[krstnmnlsn, 2015/06/30 17:39:11]

Yes BluetoothAdapterMac::LowEnergyDeviceUpdated(...) will call it (after being
called by BluetoothLowEnergyDiscoveryManagerMac::DiscoveredPeripheral(...)).

                                          NSDictionary* advertisementData,
                                          int rssi) {
+  last_update_time = [NSDate date];

[armansito, 2015/06/30 20:44:39]

Does Chrome have ARC enabled? If you're explicitly managing the retain count
then you'll need to either release the old NSDate instance here or use a
scoped_nsobject.

[krstnmnlsn, 2015/07/01 17:37:16]

We don't use ARC.  Meant for this to be a scoped_nsobject, thanks!

   peripheral_.reset([peripheral retain]);
   rssi_ = rssi;
   ClearServiceData();
@@ -226,6 +227,10 @@ void BluetoothLowEnergyDeviceMac::CreateGattConnection(
   NOTIMPLEMENTED();
 }
 
+NSDate* BluetoothLowEnergyDeviceMac::GetLastUpdateTime() const {
+  return last_update_time;
+}
+
 std::string BluetoothLowEnergyDeviceMac::GetDeviceName() const {
   return base::SysNSStringToUTF8([peripheral_ name]);
 }