GitLab

wayland-protocols: Add device_configuration_exists error to zcr_keyboard_configuration_v1 interface.

This error is produced if get_keyboard_device_configuration method is
called with a keyboard object that is already associated with
keyboard device configuration object.

BUG=670247

Review-Url: https://codereview.chromium.org/2564353002
Cr-Commit-Position: refs/heads/master@{#437953}