[gnome-games] runner: Add new_savestate_created() signal

[Alexander Mikhaylenko <alexm src gnome org>]

commit 2752c9520c80f61a0ad9e0c87a23ccbbb2d1fbcd
Author: Yetizone <andreii lisita gmail com>
Date:   Fri Aug 16 00:01:27 2019 +0300

    runner: Add new_savestate_created() signal
    
    This will be used in the next commit to notify the display-box when a new
    savestate has been created so that it will flash the screen.

 src/core/runner.vala        | 1 +
 src/retro/retro-runner.vala | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/src/core/runner.vala b/src/core/runner.vala
index ce0eab23..50de8b5d 100644
--- a/src/core/runner.vala
+++ b/src/core/runner.vala
@@ -1,6 +1,7 @@
 // This file is part of GNOME Games. License: GPL-3.0+.
 
 public interface Games.Runner : Object {
+       public signal void new_savestate_created ();
        public signal void stopped ();
 
        public abstract bool can_fullscreen { get; }
diff --git a/src/retro/retro-runner.vala b/src/retro/retro-runner.vala
index bedb2b7b..b31bc245 100644
--- a/src/retro/retro-runner.vala
+++ b/src/retro/retro-runner.vala
@@ -455,6 +455,7 @@ public class Games.RetroRunner : Object, Runner {
                        return null;
 
                try {
+                       new_savestate_created ();
                        return create_savestate (is_automatic);
                }
                catch (Error e) {