Implement BluetoothRemoteGattCharacteristicWin::StartNotifySession and related unit tests

device/bluetooth/bluetooth_low_energy_win.h

Index: device/bluetooth/bluetooth_low_energy_win.h
diff --git a/device/bluetooth/bluetooth_low_energy_win.h b/device/bluetooth/bluetooth_low_energy_win.h
index cd7150d18418ec73e53fd89f17cc346eb4ba7028..869673a621ce2374a4abff7934237709500d0455 100644
--- a/device/bluetooth/bluetooth_low_energy_win.h
+++ b/device/bluetooth/bluetooth_low_energy_win.h
@@ -176,6 +176,19 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyWrapper {
       const PBTH_LE_GATT_CHARACTERISTIC characteristic,
       PBTH_LE_GATT_CHARACTERISTIC_VALUE new_value);
 
+  // Register |event_type| of GATT events of the service with service device

[ortuno, 2016/03/07 18:48:45]

Register for GATT events of |event_type|...

[gogerald1, 2016/03/07 22:52:49]

Done.

+  // path |service_path|. |event_parameter| is the event's parameter. |callback|
+  // is the function to be invoked if the event happened. |context| is the input
+  // parameter to be given back through |callback|. |*out_handle| stores the
+  // unique handle in OS for this registration.
+  virtual HRESULT RegisterGattEvents(base::FilePath& service_path,
+                                     BTH_LE_GATT_EVENT_TYPE event_type,
+                                     PVOID event_parameter,
+                                     PFNBLUETOOTH_GATT_EVENT_CALLBACK callback,
+                                     PVOID context,
+                                     BLUETOOTH_GATT_EVENT_HANDLE* out_handle);
+  virtual HRESULT UnregisterGattEvent(BLUETOOTH_GATT_EVENT_HANDLE event_handle);
+
  protected:
   BluetoothLowEnergyWrapper();
   virtual ~BluetoothLowEnergyWrapper();