[gnome-games] gamepad: Add MappingError

[Adrien Plazas <aplazas src gnome org>]

commit 29c4ab5c38dae09c45db657ab1ceef1e9aaab6d2
Author: Megh Parikh <meghprkh gmail com>
Date:   Mon Jul 18 22:28:17 2016 +0530

    gamepad: Add MappingError
    
    This error domain is used to represent errors that arise while mapping the
    controls of a gamepad.
    
    This is part of a series of commits to add gamepad support.

 src/Makefile.am                        |    1 +
 src/gamepad/gamepad-mapping-error.vala |    5 +++++
 2 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index d999c21..c75991c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -56,6 +56,7 @@ gnome_games_SOURCES = \
        gamepad/gamepad-callbacks.vala \
        gamepad/gamepad-input-type.vala \
        gamepad/gamepad-mapped-event.vala \
+       gamepad/gamepad-mapping-error.vala \
        gamepad/gamepad-mappings-manager.vala \
        gamepad/linux/linux-raw-gamepad.vala \
        gamepad/linux/linux-raw-gamepad-monitor.vala \
diff --git a/src/gamepad/gamepad-mapping-error.vala b/src/gamepad/gamepad-mapping-error.vala
new file mode 100644
index 0000000..72c75b4
--- /dev/null
+++ b/src/gamepad/gamepad-mapping-error.vala
@@ -0,0 +1,5 @@
+// This file is part of GNOME Games. License: GPLv3
+
+private errordomain Games.GamepadMappingError {
+       NOT_A_MAPPING,
+}