[gnome-games] dummy: Add DummyCover

[Adrien Plazas <aplazas src gnome org>]

commit 31ff0d394433e36dfdb4980298397afc76cd97ea
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Mar 23 16:29:42 2016 +0100

    dummy: Add DummyCover
    
    This will be used in subsequent commits to create generic games with no
    cover.

 src/Makefile.am            |    1 +
 src/dummy/dummy-cover.vala |    7 +++++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 53ea33e..795341c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -46,6 +46,7 @@ gnome_games_SOURCES = \
        core/title.vala \
        core/uid.vala \
        \
+       dummy/dummy-cover.vala \
        dummy/dummy-game.vala \
        dummy/dummy-game-source.vala \
        dummy/dummy-runner.vala \
diff --git a/src/dummy/dummy-cover.vala b/src/dummy/dummy-cover.vala
new file mode 100644
index 0000000..daf0e8d
--- /dev/null
+++ b/src/dummy/dummy-cover.vala
@@ -0,0 +1,7 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.DummyCover : Object, Cover {
+       public Icon? get_cover () {
+               return null;
+       }
+}