Implement create attribute API functions for BTLE.

device/bluetooth/bluetooth_adapter_win.cc

Index: device/bluetooth/bluetooth_adapter_win.cc
diff --git a/device/bluetooth/bluetooth_adapter_win.cc b/device/bluetooth/bluetooth_adapter_win.cc
index b74b3948351676ecf6a684ce8a022cf23877d727..fe537fd9916a8d7d106cdee68c3c826fec2a89b3 100644
--- a/device/bluetooth/bluetooth_adapter_win.cc
+++ b/device/bluetooth/bluetooth_adapter_win.cc
@@ -202,6 +202,11 @@ void BluetoothAdapterWin::RegisterAdvertisement(
   error_callback.Run(BluetoothAdvertisement::ERROR_UNSUPPORTED_PLATFORM);
 }
 
+BluetoothLocalGattService* BluetoothAdapterWin::GetGattService(
+    const std::string& identifier) const {
+  return nullptr;
+}
+
 void BluetoothAdapterWin::RemovePairingDelegateInternal(
     BluetoothDevice::PairingDelegate* pairing_delegate) {
 }