[gnome-boxes] libvirt-machine: Allow prefixing snapshot description

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 3d3390137ab3ec9a58c1e93d22822d5e3f4806c0
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Wed Dec 23 20:49:43 2015 +0000

    libvirt-machine: Allow prefixing snapshot description

 src/libvirt-machine.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/libvirt-machine.vala b/src/libvirt-machine.vala
index a8c4d0f..5722bcc 100644
--- a/src/libvirt-machine.vala
+++ b/src/libvirt-machine.vala
@@ -705,11 +705,11 @@ private class Boxes.LibvirtMachine: Boxes.Machine {
         return null;
     }
 
-    public async GVir.DomainSnapshot create_snapshot () throws GLib.Error {
+    public async GVir.DomainSnapshot create_snapshot (string description_prefix = "") throws GLib.Error {
         var config = new GVirConfig.DomainSnapshot ();
         var now = new GLib.DateTime.now_local ();
         config.set_name (now.format ("%F-%H-%M-%S"));
-        config.set_description (now.format ("%x, %X"));
+        config.set_description (description_prefix + now.format ("%x, %X"));
 
         return yield domain.create_snapshot_async (config, 0, null);
     }