device/bluetooth: Introduce BluetoothGattConnection.

device/bluetooth/bluetooth_device_mac.mm

Index: device/bluetooth/bluetooth_device_mac.mm
diff --git a/device/bluetooth/bluetooth_device_mac.mm b/device/bluetooth/bluetooth_device_mac.mm
index 5936ec3ec80e3101de8b09d8b4374d26c201ee66..c2dcb00d246a0c6c593ff078d5945ef64669aa0a 100644
--- a/device/bluetooth/bluetooth_device_mac.mm
+++ b/device/bluetooth/bluetooth_device_mac.mm
@@ -219,6 +219,13 @@ void BluetoothDeviceMac::ConnectToService(
       device_.get(), uuid, base::Bind(callback, socket), error_callback);
 }
 
+void BluetoothDeviceMac::CreateGattConnection(
+      const GattConnectionCallback& callback,
+      const ConnectErrorCallback& error_callback) {
+  // TODO(armansito): Implement.
+  error_callback.Run(ERROR_UNKNOWN);

[Ilya Sherman, 2014/06/17 21:53:48]

nit: Do you think it's worth having an ERROR_UNIMPLEMENTED, so that an app
developer gets a clearer message as to what's gone wrong?

[armansito, 2014/06/18 02:03:06]

hmm, I'm not sure if ConnectErrorCode is the correct enum for that. I guess it
is a valid connect error since we have two platforms now that won't implement
this function any time soon. We can always remove it later once it is all
implemented.

+}
+
 void BluetoothDeviceMac::StartConnectionMonitor(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {