[gnome-builder] plugins/sessionui: add hooks for session save/restore

[Christian Hergert <chergert src gnome org>]

commit fcc0c26e68717223e80b1e5871ac50be1143ff9e
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 14 17:01:01 2022 -0700

    plugins/sessionui: add hooks for session save/restore

 .../sessionui/gbp-sessionui-workbench-addin.c      | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/src/plugins/sessionui/gbp-sessionui-workbench-addin.c 
b/src/plugins/sessionui/gbp-sessionui-workbench-addin.c
index 1023feaae..8cf1a51ae 100644
--- a/src/plugins/sessionui/gbp-sessionui-workbench-addin.c
+++ b/src/plugins/sessionui/gbp-sessionui-workbench-addin.c
@@ -56,11 +56,33 @@ gbp_sessionui_workbench_addin_unload (IdeWorkbenchAddin *addin,
   self->workbench = NULL;
 }
 
+static void
+gbp_sessionui_workbench_addin_save_session (IdeWorkbenchAddin *addin,
+                                            IdeSession        *session)
+{
+  GbpSessionuiWorkbenchAddin *self = (GbpSessionuiWorkbenchAddin *)addin;
+
+  g_assert (GBP_IS_SESSIONUI_WORKBENCH_ADDIN (self));
+  g_assert (IDE_IS_SESSION (session));
+}
+
+static void
+gbp_sessionui_workbench_addin_restore_session (IdeWorkbenchAddin *addin,
+                                               IdeSession        *session)
+{
+  GbpSessionuiWorkbenchAddin *self = (GbpSessionuiWorkbenchAddin *)addin;
+
+  g_assert (GBP_IS_SESSIONUI_WORKBENCH_ADDIN (self));
+  g_assert (IDE_IS_SESSION (session));
+}
+
 static void
 workbench_addin_iface_init (IdeWorkbenchAddinInterface *iface)
 {
   iface->load = gbp_sessionui_workbench_addin_load;
   iface->unload = gbp_sessionui_workbench_addin_unload;
+  iface->save_session = gbp_sessionui_workbench_addin_save_session;
+  iface->restore_session = gbp_sessionui_workbench_addin_restore_session;
 }
 
 G_DEFINE_FINAL_TYPE_WITH_CODE (GbpSessionuiWorkbenchAddin, gbp_sessionui_workbench_addin, G_TYPE_OBJECT,